| ALD020 | During your life, on how many days have you had at least one drink of alcohol? | ALQYTH | Alcohol Use - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| ALD030 | During the past 30 days, on how many days did you have at least one drink of alcohol? | ALQYTH | Alcohol Use - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| ALD040 | During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? | ALQYTH | Alcohol Use - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| ALQ010 | English Text: The following questions ask about alcohol use. This includes beer, wine, wine coolers, and liquor such as rum, gin, vodka, or whiskey. This does not include drinking a few sips of wine for religious purposes. How old were you when you had your first drink of alcohol, other than a few sips? | ALQYTH | Alcohol Use - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SEQN | Respondent sequence number. | ALQYTH | Alcohol Use - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| LB2BAP | Bone alkaline phosphotase (ug/L) | L11_2_R | C-Reactive Protein & Others, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2CRP | C-reactive protein(mg/dL) | L11_2_R | C-Reactive Protein & Others, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | Days between 1st and 2nd exam | L11_2_R | C-Reactive Protein & Others, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FB | Fibrinogen (mg/dL) | L11_2_R | C-Reactive Protein & Others, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FBSI | Fibrinogen (g/L) | L11_2_R | C-Reactive Protein & Others, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | L11_2_R | C-Reactive Protein & Others, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| UR2NT | N-telopeptides (nmol BCE) | L11_2_R | C-Reactive Protein & Others, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LBXHE2 | Herpes II | l09rdc_a | Herpes Simplex Virus Type-2 - Youth | 1999 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | l09rdc_a | Herpes Simplex Virus Type-2 - Youth | 1999 | 2000 | Laboratory | RDC Only |
| DX2DAY | Number of days between the primary and the second day exams. | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2EXSTS | | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HEA | Head Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HEBMC | Head Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HEBMD | Head Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HEBV | Head Bone Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HEFAT | Head Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HELE | Head Lean excl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HELI | Head Lean incl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HEPF | Head Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HETOT | Head Total (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2HETV | Head Tissue Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LAA | Left Arm Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LABMC | Left Arm Body Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LABMD | Left Arm Body Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LABV | Left Arm Bone Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LAFAT | Left Arm Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LALE | Left Arm Lean excl Body Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LALI | Left Arm Lean incl BMC (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LAPF | Left Arm Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LATOT | Left Arm Total (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LATV | Left Arm Tissue Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLA | Left Leg Area(cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLBMC | Left Leg Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLBMD | Left Leg Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLBV | Left Leg Bone Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLFAT | Left Leg Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLLE | Left Leg Lean excl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLLI | Left Leg Lean incl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLPF | Left Leg Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLTOT | Left Leg Total (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LLTV | Left Leg Tissue Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LRA | Left Ribs Area(cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LRBMC | Left Ribs Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LRBMD | Left Ribs Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LSA | Lumbar Spine Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LSBMC | Lumbar Spine Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2LSBMD | Lumbar Spine Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2PEA | Pelvis Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2PEBMC | Pelvis Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2PEBMD | Pelvis Bone Mineral Density (grams/cm^2)
| DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RAA | Right Arm Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RABMC | Right Arm Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RABMD | Right Arm Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RABV | Right Arm Bone Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RAFAT | Right Arm Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RALE | Right Arm Lean excl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RALI | Right Arm Lean incl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RAPF | Right Arm Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RATOT | Right Arm Total (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RATV | Right Arm Tissue Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLA | Right Leg Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLBMC | Right Leg Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLBMD | Right Leg Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLBV | Right Leg Bone Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLFAT | Right Leg Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLLE | Right Leg Lean excl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLLI | Right Leg Lean incl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLPF | Right Leg Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLTOT | Right Leg Total (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RLTV | Right Leg Tissue Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RRA | Right Ribs Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RRBMC | Right Ribs Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2RRBMD | Right Ribs Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STA | Subtotal Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STBCC | Subtotal Bone Validity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STBMC | Subtotal Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STBMD | Subtotal Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STFAT | Subtotal Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STLE | Subtotal Lean excl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STLI | Subtotal Lean incl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STPF | Subtotal Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STPFC | Subtotal Percent Fat Validity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2STTOT | Subtotal (Total excl Head) (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TECH | Technicians for the primary and the second day exams. | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOA | Total Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOBCC | Total Bone Mineral Density Validity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOBMC | Total Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOBMD | Total Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOFAT | Total Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOLE | Total Lean excl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOLI | Total Lean incl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOPF | Total Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOPFC | Total Percent Fat Validity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TOTOT | Total Lean incl BMC and Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRA | Trunk Bone area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRBMC | Trunk Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRBMD | Trunk Bone BMD (g/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRBV | Trunk Bone Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRFAT | Trunk Fat (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRLE | Trunk Lean excl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRLI | Trunk Lean incl Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRPF | Trunk Percent Fat | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRTOT | Trunk Total (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TRTV | Trunk Tissue Invalidity Code | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TSA | Thoracic Spine Area (cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TSBMC | Thoracic Spine Bone Mineral Content (grams) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| DX2TSBMD | Thoracic Spine Bone Mineral Density (grams/cm^2) | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| SEQN | | DXX_2_00 | Dual-Energy X-ray Absorptiometry - Whole Body, Second Exam | 2000 | 2000 | Examination | RDC Only |
| SEQN | Respondent sequence number. | L05RDC_A | Chlamydia & Gonorrhea - Urine - Youth | 1999 | 2000 | Laboratory | RDC Only |
| URXUCL | Chlamydia, urine | L05RDC_A | Chlamydia & Gonorrhea - Urine - Youth | 1999 | 2000 | Laboratory | RDC Only |
| URXUGC | Gonorrhea, urine | L05RDC_A | Chlamydia & Gonorrhea - Urine - Youth | 1999 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ010 | The next set of questions ask about things you may have done that can get people in trouble. In the last year, have you been expelled from school for misbehavior—that is, told you could never go back to that school at all? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ020 | In the last year, have you shoplifted—that is, stolen something from a store when you thought no one was looking? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ030 | In the last year, have you lied to get money or something else you wanted? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ040 | In the last year, have you snatched someone's purse or jewelry? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ050 | In the last year, have you broken something or messed up some place on purpose, like breaking windows, writing on a building, or slashing tires? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ060 | In the last year, have you stolen from anyone else when they weren't around or weren't looking? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ070 | In the last year, have you been physically cruel to an animal and hurt it on purpose? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| YCQ080 | In the last year, have you broken into a house, a building, or a car? | YCQ | Mental Health - Conduct Disorder - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| LB2B12 | Vitamin B12, serum (pg/mL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2B12SI | Vitamin B12, serum (pmol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2BCD | Cadmium (ug/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2BCDSI | Cadmium (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2BPB | Lead (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2BPBSI | Lead (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2COT | Cotinine (ng/mL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2COTSI | Cotinine (nmol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | The number of days between the first and second collections | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2EPP | Erythrocyte protoporphyrin (ug/dL RBC)
| L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2EPPSI | Erythrocyte protoporphyrin (umol/L RBC)
| L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FER | Ferritin (ng/mL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FERSI | Ferritin (ug/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FOL | Folate, serum (ng/mL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FOLSI | Folate, serum (nmol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2GTC | Gamma tocopherol (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2GTCSI | Gamma tocopherol (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2HCY | Homocysteine (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2IRN | Iron (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2IRNSI | Iron (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2MMA | Methylmalonic acid (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2PCT | Transferrin saturation (%) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RBF | Folate (ng/mL RBC) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RBFSI | Folate (nmol/L RBC) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RPL | Retinyl palmitate (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RPLSI | Retinyl palmitate (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RST | Retinyl stearate (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RSTSI | Retinyl stearate (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2TIB | TIBC (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2TIBSI | TIBC (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIA | Vitamin A (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIASI | Vitamin A (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIE | Vitamin E (ug/dL) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIESI | Vitamin E (umol/L) | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | L06_2_00 | Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | Days between first and second exams | VID_2_00 | Vitamin D, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VID | Vitamin D (ng/mL) | VID_2_00 | Vitamin D, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | VID_2_00 | Vitamin D, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2CP | C-peptide: pmol/mL | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2CPSI | C-peptide SI(nmol/L) | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | Days between the 1st and 2nd exams | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2GH | Glycohemoglobin (%) | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2GLU | Plasma glucose (mg/dL) | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2GLUSI | Plasma glucose: SI(mmol/L) | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2IN | Insulin (uU/mL) | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2INSI | Insulin: SI(pmol/L) | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | l10_2_00 | Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | The number of days between the collection of the first and second exam | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FSH | Follicle stimulating hormone (mIU/mL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2FSHSI | Follicle stimulating hormone (IU/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2LH | Luteinizing hormone (mIU/mL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2LHSI | Luteinizing hormone (IU/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SAL | Albumin (g/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SALSI | Albumin (g/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SAPSI | Alkaline phosphotase (U/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SASSI | Aspartate aminotransferase (U/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SATSI | Alanine aminotransferase (U/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SBU | Blood urea nitrogen (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SBUSI | Blood urea nitrogen (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SC3SI | Bicarbonate (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SCA | Total calcium (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SCASI | Total calcium (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SCH | Cholesterol (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SCHSI | Cholesterol (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SCLSI | Chloride (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SCR | Creatinine (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SCRSI | Creatinine (umol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SGL | Glucose (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SGLSI | Glucose, serum (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SGTSI | Gamma glutamyltransferase | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SIR | Iron (ug/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SIRSI | Iron (umol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SKSI | Potassium (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SLDSI | Lactate dehydrogenase (U/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SNASI | Sodium (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SPH | Phosphorus (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SPHSI | Phosphorus (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2STB | Bilirubin, total (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2STBSI | Bilirubin, total (umol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2STP | Protein, total (g/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2STPSI | Total protein (g/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2STR | Triglycerides (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2STRSI | Triglycerides (mmol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SUA | Uric acid (mg/dL) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2SUASI | Uric acid (umol/L) | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | l18_2_00 | Standard Biochemistry Profile & Hormones, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | Days between 1st and 2nd exam | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2HDL | HDL-cholesterol (mg/dL) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2HDLSI | HDL-cholesterol (mmol/L) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2LDL | LDL-cholesterol (mg/dL) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2LDLSI | LDL-cholesterol (mmol/L) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2TC | Total cholesterol (mg/dL) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2TCSI | Total cholesterol (mmol/L) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2TR | Triglyceride (mg/dL) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2TRSI | Triglyceride (mmol/L) | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | l13_2_r | Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | The number of days between the collection of the first and second exam | L19_2_R | Measles, Rubella, & Varicella, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2ME | Measles | L19_2_R | Measles, Rubella, & Varicella, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RU | Rubella | L19_2_R | Measles, Rubella, & Varicella, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RUIU | Rubella antibody (international units)
| L19_2_R | Measles, Rubella, & Varicella, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VAR | Varicella | L19_2_R | Measles, Rubella, & Varicella, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | L19_2_R | Measles, Rubella, & Varicella, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | The number of days between the collection of the first and second exam | L16_2_R | Creatinine & Albumin - Urine, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | L16_2_R | Creatinine & Albumin - Urine, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| UR2UCR | Creatinine, urine (mg/dL) | L16_2_R | Creatinine & Albumin - Urine, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| UR2UCRSI | Creatinine, urine (umol/L) | L16_2_R | Creatinine & Albumin - Urine, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| UR2UMA | Albumin, urine (ug/mL) | L16_2_R | Creatinine & Albumin - Urine, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| UR2UMASI | Albumin, urine (mg/L) SI | L16_2_R | Creatinine & Albumin - Urine, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2BANO | Basophils number (1000 cells/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2BAPCT | Basophils percent (%) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | Days between first and second exam | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2EONO | Eosinophils number (1000 cells/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2EOPCT | Eosinophils percent (%) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2HCT | Hematocrit (%) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2HGB | Hemoglobin (g/dL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2LYMNO | Lymphocyte number (1000 cells/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2LYPCT | Lymphocyte percent (%) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2MC | MCHC (g/dL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2MCHSI | Mean cell hemoglobin (pg) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2MCVSI | Mean cell volume (fL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2MONO | Monocyte number (1000 cells/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2MOPCT | Monocyte percent (%) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2MPSI | Mean platelet volume (fL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2NENO | Segmented neutrophils num (1000 cell/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2NEPCT | Segmented neutrophils percent (%) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2PLTSI | Platelet count (1000 cells/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RBCSI | Red blood cell count (million cells/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RDW | Red cell distribution width (%) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2WBCSI | White blood cell count (1000 cells/uL) | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | l25_2_r | Complete Blood Count with 5-part Differential - Whole Blood, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2DAY | The number of days between the collection of the first and second exam | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2GTC | gamma-tocopherol(ug/dL) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2GTCSI | gamma-tocopherol(umol/L) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RPL | Retinyl palmitate(ug/dL) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RPLSI | Retinyl palmitate(umol/L) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RST | Retinyl stearate(ug/dL) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2RSTSI | Retinyl stearate(umol/L) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIA | Retinol(ug/dL) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIASI | Retinol(umol/L) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIE | alpha-tocopherol(ug/dL) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| LB2VIESI | alpha-tocopherol(umol/L) | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | VIT_2_R | Vitamin A & Vitamin E, Second Exam | 2000 | 2000 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXD030 | How old were you when you had sex for the first time? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ020 | The next set of questions is about your sexual behavior. By sex, we mean vaginal, oral, or anal sex. Please remember that your answers are strictly confidential. Have you ever had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ040 | During your life, with how many people have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ050 | The last time you had sex, did you or your partner use a condom? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ100 | In your lifetime, with how many men have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ120 | In the past 12 months, with how many men have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ130 | In your lifetime, with how many women have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ150 | In the past 12 months, with how many women have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ170 | In your lifetime, with how many women have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ190 | In the past 12 months, with how many women have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ200 | In your lifetime, with how many men have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ220 | In the past 12 months, with how many men have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ240 | In the past 30 days, with how many partners have you had sex? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ250 | In the past 30 days, how many times have you had sex without using a condom? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ260 | Has a doctor or other health care professional ever told you that you had genital herpes? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ265 | Has a doctor or other health care professional ever told you that you had genital warts? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ270 | In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ272 | In the past 12 months, has a doctor or other health care professional told you that you had chlamydia? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |
| SXQ280 | Are you circumcised or uncircumcised? | SXQYTH | Sexual Behavior - Youth | 1999 | 2000 | Questionnaire | RDC Only |