| SEQN | Respondent sequence number. | SSFOL_B | Folic Acid - Unmetabolized (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSFOL | Folic Acid ng/ml | SSFOL_B | Folic Acid - Unmetabolized (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSFOLSI | Folic Acid pmol/ml | SSFOL_B | Folic Acid - Unmetabolized (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSFOLTOT | Total Folate ng/ml | SSFOL_B | Folic Acid - Unmetabolized (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSFOLTSI | Total Folate pmol/ml | SSFOL_B | Folic Acid - Unmetabolized (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSMET | Methyltetrahydrofolate ng/ml | SSFOL_B | Folic Acid - Unmetabolized (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSMETSI | Methyltetrahydrofolate pmol/ml | SSFOL_B | Folic Acid - Unmetabolized (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| LBXHE2 | Herpes II | l09rdc_b | Herpes Simplex Virus Type-2 - Youth | 2001 | 2002 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | l09rdc_b | Herpes Simplex Virus Type-2 - Youth | 2001 | 2002 | Laboratory | RDC Only |
| LB2DAY | Days between the 1st and 2nd exams | HP2_01_R | Helicobacter pylori (HP1), Second Exam | 2001 | 2001 | Laboratory | RDC Only |
| LB2HP1 | Helicobacter pylori (HP1) | HP2_01_R | Helicobacter pylori (HP1), Second Exam | 2001 | 2001 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | HP2_01_R | Helicobacter pylori (HP1), Second Exam | 2001 | 2001 | Laboratory | RDC Only |
| LBXHP1 | Helicobacter pylori (HP1) | HP_01_R | Helicobacter pylori (HP1) | 2001 | 2001 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | HP_01_R | Helicobacter pylori (HP1) | 2001 | 2001 | Laboratory | RDC Only |
| WTMEC1YR | Full sample 1 year MEC weight | HP_01_R | Helicobacter pylori (HP1) | 2001 | 2001 | Laboratory | RDC Only |
| LBXBV | Bacterial Vaginosis
| l34_b_r | Bacterial vaginosis (BV) & Trichomonas vaginalis - Youth | 2001 | 2002 | Laboratory | RDC Only |
| LBXBVPH | PH of Bacterial Vaginosis Specimen | l34_b_r | Bacterial vaginosis (BV) & Trichomonas vaginalis - Youth | 2001 | 2002 | Laboratory | RDC Only |
| LBXTV | Trichomonas Vaginalis
| l34_b_r | Bacterial vaginosis (BV) & Trichomonas vaginalis - Youth | 2001 | 2002 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | l34_b_r | Bacterial vaginosis (BV) & Trichomonas vaginalis - Youth | 2001 | 2002 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | L05RDC_B | Chlamydia & Gonorrhea - Urine - Youth | 2001 | 2002 | Laboratory | RDC Only |
| URXUCL | Chlamydia, urine | L05RDC_B | Chlamydia & Gonorrhea - Urine - Youth | 2001 | 2002 | Laboratory | RDC Only |
| URXUGC | Gonorrhea, urine | L05RDC_B | Chlamydia & Gonorrhea - Urine - Youth | 2001 | 2002 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | YCQ_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | 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_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | 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_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| YCQ030 | In the last year, have you lied to get money or something else you wanted? | YCQ_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| YCQ040 | In the last year, have you snatched someone's purse or jewelry? | YCQ_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | 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_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| YCQ060 | In the last year, have you stolen from anyone else when they weren't around or weren't looking? | YCQ_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| YCQ070 | In the last year, have you been physically cruel to an animal and hurt it on purpose? | YCQ_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| YCQ080 | In the last year, have you broken into a house, a building, or a car? | YCQ_B | Mental Health - Conduct Disorder - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SEQN | Respondent sequence number. | SSFA_B_R | Folate - Folic acid & 5-methyltetrahydrofolate - Serum (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSSF1 | 5-Methyltetrahydrofolic acid (nmol/L) | SSFA_B_R | Folate - Folic acid & 5-methyltetrahydrofolate - Serum (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SSSF2 | Folic Acid (nmol/L) | SSFA_B_R | Folate - Folic acid & 5-methyltetrahydrofolate - Serum (Surplus) | 2001 | 2002 | Laboratory | RDC Only |
| SEQN | Respondent sequence number. | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXD030 | How old were you when you had sex for the first time? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXD240 | In the past 30 days, with how many people have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | 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_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ040 | During your life, with how many people have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ050 | The last time you had sex, did you or your partner use a condom? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ100 | In your lifetime, with how many men have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ120 | In the past 12 months, with how many men have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ130 | In your lifetime, with how many women have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ150 | In the past 12 months, with how many women have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ170 | In your lifetime, with how many women have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ190 | In the past 12 months, with how many women have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ200 | In your lifetime, with how many men have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ220 | In the past 12 months, with how many men have you had sex? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ250 | In the past 30 days, how many times have you had sex without using a condom? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ260 | Has a doctor or other health care professional ever told you that you had genital herpes? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ265 | Has a doctor or other health care professional ever told you that you had genital warts? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | 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_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ272 | In the past 12 months, has a doctor or other health care professional told you that you had chlamydia? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ280 | Are you circumcised or uncircumcised? | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ292 | Do you think of yourself as... | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |
| SXQ294 | Do you think of yourself as... | SXQYTH_B | Sexual Behavior - Youth | 2001 | 2002 | Questionnaire | RDC Only |