The Third National Health and Nutrition Examination Survey (NHANES III), 1988-94, Series 11, No. 17A (Hip Bone Geometry) Data Release. The National Center for Health Statistics (NCHS) of the Centers for Disease Control and Prevention (CDC) collects, analyzes, and disseminates data on the health status of U.S. residents. The results of surveys, analyses, and studies are made known through a number of data release mechanisms including publications, mainframe computer data files, CD-ROMs (Search and Retrieval Software, Statistical Export and Tabulation System (SETS), and the Internet. The National Health and Nutrition Examination Survey (NHANES) is a periodic survey conducted by NCHS. The third National Health and Nutrition Examination Survey (NHANES III), conducted from 1988 through 1994, was the seventh in a series of these surveys based on a complex, multi-stage sample plan. It was designed to provide national estimates of the health and nutritional status of the United States' civilian, noninstitutionalized population aged two months and older. This data release, Series 11 No. 17A, contains the NHANES III Hip Bone Geometry data file and documentation. This data release does not replace the previous NHANES III data releases. The released data is in flat text format. A SAS program is provided to read the flat data. The user is advised to have someone familiar with SAS data step adapt the provided SAS program to his or her specific SAS environment. The following table summarizes the NHANES III data releases which are currently available. Table 1. Available NHANES III Data +----------------------+--------+---------+------------------------------------+ |Data Release Number |Release |Size in |Data Files / Description | | |Date |Megabytes| | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |June | 0.04 |Hip Bone Geometry data file and | |Series 11, No. 17A, |2003 | |documentation | |ASCII Version (This | | | | |release) | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |August | 0.4 |Diphtheria antibody (IU/ml) data | |Series 11, No. 16A, |2002 | |file and documentation | |ASCII Version (This | | | | |release) | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |August | 0.2 |Antibody to measles data file and | |Series 11, No. 15A, |2002 | |documentation | |ASCII Version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |June | 0.2 |Antibody to human Papillomavirus-16 | |Series 11, No. 14A, |2002 | |data file and documentation | |ASCII Version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |March | 0.5 |Dental Pathogen data file | |Series 11, No. 13A, |2002 | |and documentation | |ASCII Version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |January | 0.2 |Serum leptin data file and | |Series 11, No. 12A, |2002 | |documentation | |ASCII Version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |October | 0.2 |Knee osteoarthritis X-ray data file | |Series 11, No. 11A, |2001 | |and documentation | |ASCII Version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |October | 0.2 |Hepatitis C virus genotype data | |Series 11, No. 10A, |2001 | |file and documentation | |ASCII Version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |June | 240 |Raw spirometry data file and | |Series 11, No. 9A, |2001 | |documentation | |ASCII Version | | | | +----------------------+------ -+---------+------------------------------------+ |NHANES III, 1988-94, |TBA | 9.7 |Natality data file and | |Series 11, No. 8A, | | |documentation | |ASCII Version | | | | +----------------------+------ -+---------+------------------------------------+ |NHANES III, 1988-94, |June | 78.8 |Multiply Imputed Data Files and | |Multiply Imputed Data |2001 | |reports | |Set, Series 11, No. | | | | |7A, ASCII version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |January | 2.7 |Healthy Eating Index (HEI) Data File| |Series 11, No. 6A, |2000 | |and documentation includes number | |ASCII Version | | |of servings by Food Guide Pyramid | | | | |food groups and HEI | |----------------------|--------|---------|------------------------------------+ |NHANES III, 1988-94, |April | 54 |Supplemental Nutrition Survey of | |Series 11, No. 5A, |2000 | |older Americans (SNS)contains | |ASCII Version | | |subsets of individual foods | | | | |and total nutrients intake data | | | | |files and documentation | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |Septem- | 0.5 |Priority toxicant reference range | |Series 11, No. 4A, |ber 2000| |study data file and documentation | |ASCII Version | | | | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |July | 33 |Second exam sample files for | |Series 11, No. 3A, |1999 | |dietary recall, examination, | |ASCII Version | | |laboratory, additional laboratory | | | | |analytes and documentation | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |April | 407 |Dietary recall (replacement), | |Series 11, No. 2A, |1998 | |electrocardiography, laboratory | |ASCII Version | | |(additional analytes), and | | | | |vitamins/medicines data files and | | | | |documentation | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |October | 285 |Adult and youth household | |Series 11, No. 1, |1997 | |questionnaire, examination, and | |Revised SETS Version | | |laboratory data files and | |1.22a | | |documentation, plan and operation, | | | | |analytic and reporting guidelines, | | | | |weighting and estimation | | | | |methodology, field operations, | | | | |non-response bias | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |July | 454 |Adult and youth household | |Series 11, No. 1A, |1997 | |questionnaire, dietary recall, | |ASCII Version | | |examination, and laboratory data | | | | |files and documentation | +----------------------+--------+---------+------------------------------------+ |NHANES III, 1988-94, |July | 285 |Adult and youth household | |Series 11, No. 1, |1997 | |questionnaire, examination, and | |SETS Version 1.22a * | | |laboratory data files and | | | | |documentation | +----------------------+--------+---------+------------------------------------+ |NHANES III Reference |October | 152 |Plan and operation, analytic and | |Manuals and Reports |1996 | |reporting guidelines, weighting and | |October 1996 | | |estimation methodology, field | | | | |operations, non-response bias | +----------------------+--------+---------+------------------------------------+ * Do not use this CD-ROM. It had technical problems and has been superseded by the revised SETS version 1.22a, Series 11, No. 1, released in October 1997. The first release of NHANES III data is available on three different CD-ROMs. The first CD-ROM, Series 11, No. 1 SETS Version 1.22a contains data accessible through the Statistical Export and Tabulation System (SETS) retrieval software as well as documentation. This CD-ROM had technical problems and should not be used; it has been superseded by the Series 11, No. 1 Revised SETS Version 1.22a. This revised CD-ROM includes corrections to the SETS software and also contains the NHANES III Reference Manuals and Reports. A third CD-ROM, Series 11, No. 1A, contains the same data and documentation (except the Reference Manuals and Reports) as on the Series 11, No. 1 Revised Sets Version 1.22a CD-ROM plus the expanded dietary recall data and documentation. All data on the Series 11, No. 1A CD-ROM are in ASCII format only. Series 11, No. 1A and later releases (Series 11, No. 2A, Series 11, No. 3A, etc.) are also available at http://www.cdc.gov/nchs/about/major/nhanes/nh3data.htm. Background information on the procedures, survey components, questionnaires, examination and laboratory methods, and statistical analysis guidelines is available on the NHANES III Reference Manuals and Reports (CD-ROM and at http://www.cdc.gov/nchs/about/major/nhanes/nhanes3/cdrom/main.pdf). All data users are strongly encouraged to review these reference materials and reports before analyzing NHANES III data. Guidelines for Data Users o NHANES III survey design and demographic variables are found on the Household Adult Data File, Household Youth Data File, the Laboratory Data File and the Examination Data File. In preparing a data set for analysis, other data files should be merged with either or both of the Adult Household Data File or the Youth Household Data File to obtain many important analytic variables. o All of the NHANES III public use data files are linked with the common survey participant identification number (SEQN). Merging information from multiple NHANES III data files using this variable ensures that the appropriate information for each survey participant is linked correctly. o NHANES III public use data files do not have the same number of records on each file. The Household Questionnaire Files (divided into two files, Adult and Youth) contain more records than the Examination Data File because not everyone who was interviewed completed the examination. The Laboratory Data File contains data only for persons aged one year and older. The Individual Foods Data File based on the dietary recall, the Prescription Medication Data File, and The Vitamin and Minerals Data File all have multiple records for each person rather than the one record per sample person contained in the other data files. o For each data file, SAS program code with standard variable names and labels is provided as separate text files on the CD-ROM that contains the data files. This SAS program code can be used to create a SAS data set from the data file. o Modifications were made to items in the questionnaires, laboratory, and examination components over the course of the survey; as a result, data may not be available for certain variables for the full six years. In addition, variables may differ by phase since some changes were implemented between phases. Users are encouraged to read the Notes sections of the file documentation carefully for information about changes. o Extremely high and low values have been verified whenever possible, and numerous consistency checks have been performed. Nonetheless, users should examine the range and frequency of values before analyzing data. o Some data were not ready for release at the time of this publication due to continued processing of the data or analysis of laboratory specimens. A listing of those data are available in the general information section of each data file. o Confidential and administrative data are not available or released to the public. Additionally, some variables have been recoded to protect the confidentiality of the survey participants. For example, all age-related variables were recoded to 90+ years for persons who were 90 years of age or older. o Some variable names may differ from those used in the Phase 1 NHANES III Provisional Data Release and some variables included in the Phase 1 provisional release may not appear on these files. Do not use the Phase 1 provisional release; use the current (six-year) release. o Although the data files have been edited carefully, it is possible that errors may still exist. Please notify NCHS staff (301-458-4636) of any suspected errors in the data file or the documentation. Refer to the NCHS website at http://www.cdc.gov/nchs/about/major/nhanes/nh3data.htm for updates to these data files. Analytic Considerations o NHANES III (1988-94) was designed so that the survey's first three years, 1988-91, its last three years, 1991-94, and the entire six years were national probability samples. Analysts are encouraged to use all six years of survey results. o Sample weights are available for analyzing NHANES III data. One of the following three sample weights will be appropriate for nearly all analyses: interviewed sample final weight (WTPFQX6), examined sample final weight (WTPFEX6), and mobile examination center (MEC)- and home-examined sample final weight (WTPFHX6). Choosing which of these sample weights to use in any analysis depends on the variables being used. A good rule of thumb is to use "the least common denominator" approach. In this approach, the user checks the variables of interest. The variable that was collected on the smallest number of persons is the "least common denominator," and the sample weight that applies to that variable is the appropriate one to use for that analysis. For more detailed information, see the Analytic and Reporting Guidelines for NHANES III (U.S. DHHS, 1996). Referencing or Citing NHANES III Data o In publications, please acknowledge NCHS as the original data source. For instance, the reference for this Hip Bone Geometry Data File in this release is: U.S. Department of Health and Human Services (DHHS). National Center for Health Statistics. Third National Health and Nutrition Examination Survey, 1988-1994, NHANES III Hip Bone Geometry data file (Series 11, No. 17A). Hyattsville, MD: Centers for Disease Control and Prevention, 2003. Problems Using the Data NHANES III is a wonderfully rich source of data and NCHS encourages you to use the data for research and analysis. However, the dataset is large and complex and familiarity with data file manipulation and analysis is required. NCHS does not have the resources to perform analyses, check results, debug programs or do literature review for your work. Thorough review of the extensive documentation on the planning of the survey, analytic guidelines and individual datasets should resolve most questions. If you still have questions after careful review of the documentation, please contact the Data Dissemination Branch at (301)458-4636. -------------------------------------------------------------------------------- Hip Geometry Document DXA scans were originally collected in NHANES III in order to obtain bone mineral density data. However, after the completion of the survey, a program to reprocess DXA scans for hip geometry became available (see Hip Structural Analysis (HSA) Program description). Only sample persons with technically acceptable DXA scans for bone mineral density were eligible for hip geometry measurements. For more information about the sample with DXA scans, see the following variables in the NHANES III Examination File Dataset: a) BDPTECH: examiner who performed the DXA scan in the mobile exam center b) BDPEXFLR: flag for exclusion by protocol for DXA scans c) BDPSCAN: technical acceptability of scan for bone density after review at Mayo Clinic d) BDPSIDE: hip side that was scanned For more information about quality control for the DXA scans, see: Wahner HW, Looker A, Dunn W, Hauser M, Walters L, Novak C. Quality control of bone densitometry in a national health survey (NHANES III) using three mobile examination centers. J Bone Mineral Research 1994;9:951-60. Acceptable bone mineral measurements were obtained on 14,646 men and women ages 20 years and older in NHANES III. However, structural analysis for hip geometry was not possible for 1,031 of the 14,646 scans with acceptable data for the bone mineral analysis. Reasons for exclusion of these scans from the structural analysis were: obscured femoral neck margins, incomplete (cut-off) scans, osteoarthritic growths, metal artifacts, prosthetics or calcifications, and excessive anteversion. The total number of DXA scans analyzed for hip geometry was 13,615. For more information, see: Beck TJ, Looker AC, Ruff CB, Sievanen H, Wahner HW. Structural trends in the aging femoral neck and proximal shaft: analysis of NHANES III DXA data. J Bone Mineral Research 2000:15:2297-2304 -------------------------------------------------------------------------------- NHANES III Bone Hip Geometry Data File Index ------------------------------------------------------------------------ Variable Description Name Positions ------------------------------------------------------------------------ Respondent identification number ............ SEQN 1-5 Acceptable or rejected scan ................. BDPSCAN 6 Hologic femur neck width-cm ................. BGPFNWID 7-10 Femur neck shaft angle-degrees .............. BGPNSA 11-15 Femur neck length-cm ........................ BGPNLENG 16-19 Hip axis length-cm .......................... BGPHAL 20-24 NN bone mineral density-gm/cm sq ............ BGPNNBMD 25-29 NN Cross sect area-cm sq .................... BGPNNCSA 30-34 NN Cross sect mom inertia-cm4 ............... BGPNNCSM 35-40 NN width-cm ................................. BGPNNWID 41-44 NN endocortical diameter-cm ................. BGPNNED 45-49 NN cortical thickness-cm .................... BGPNNCT 50-54 NN profile ctr distance-cm .................. BGPNNDIS 55-58 NN center mass position-dimensionless ....... BGPNNCTR 59-63 NN section modulus-cm3 ...................... BGPNNZ 64-68 NN buckling ratio ........................... BGPNNBR 69-74 IT bone mineral density-gm/cm sq ............ BGPITBMD 75-79 IT Cross sect area-cm sq .................... BGPITCSA 80-85 IT Cross sect mom inertia-cm4 ............... BGPITCSM 86-91 IT width-cm ................................. BGPITWID 92-95 IT endocortical diameter-cm ................. BGPITED 96-100 IT cortical thickness-cm .................... BGPITCT 101-105 IT profile ctr distance-cm .................. BGPITDIS 106-109 IT center mass position-dimensionless ....... BGPITCTR 110-114 IT section modulus-cm3 ...................... BGPITZ 115-120 IT buckling ratio ........................... BGPITBR 121-126 FS bone mineral density-gm/cm sq ............ BGPFSBMD 127-131 FS Cross sect area-cm sq .................... BGPFSCSA 132-136 FS Cross sect mom inertia-cm4 ............... BGPFSCSM 137-142 FS width-cm ................................. BGPFSWID 143-146 FS endocortical diameter-cm ................. BGPFSED 147-151 FS cortical thickness-cm .................... BGPFSCT 152-156 FS profile ctr distance-cm .................. BGPFSDIS 157-160 FS center mass position-dimensionless ....... BGPFSCTR 161-165 FS section modulus-cm3 ...................... BGPFSZ 166-170 FS buckling ratio ........................... BGPFSBR 171-176 ------------------------------------------------------------------------ NHANES III Bone Hip Geometry Data File ------------------------------------------------------------------------ Positions Item description SAS name Counts and code Notes ------------------------------------------------------------------------ 1-5 Sequence number SEQN 16416 00003-53616 6 Bone Density Scan Technically Acceptable: BDPSCAN 14646 1 Yes 321 2 No 1449 8 Blank but applicable 7-10 Hologic Femur Neck Width (cm) BGPFNWID 13615 1.37-5.17 2801 8888 Blank but applicable 11-15 Femur Neck Shaft Angle(degrees) BGPNSA 13615 112.1-00156 2801 88888 Blank but applicable 16-19 Femur Neck Length (cm) BGPNLENG 13615 2.45-7.95 2801 8888 Blank but applicable 20-24 Hip Axis Length (cm) BGPHAL 12991 08.07-16.63 3425 88888 Blank but applicable 25-29 Femur Narrow Neck BGPNNBMD Bone Mineral Density (g/cm2) 13586 0.368-2.045 2830 88888 Blank but applicable 30-34 Femur Narrow Neck BGPNNCSA Cross Sectional Area (cm2) 13586 1.053-7.605 2830 88888 Blank but applicable 35-40 Femur Narrow Neck BGPNNCSM Cross Sectional Moment of Inertia (cm4) 13586 00.663-15.613 2830 888888 Blank but applicable NHANES III Bone Hip Geometry Data File ------------------------------------------------------------------------ Positions Item description SAS name Counts and code Notes ------------------------------------------------------------------------ 41-44 Femur Narrow Neck BGPNNWID Subperiosteal Width (cm) 13586 0002-5.01 2830 8888 Blank but applicable 45-49 Femur Narrow Neck BGPNNED Endocotical Diameter (cm) 13586 1.594-4.599 2830 88888 Blank but applicable 50-54 Femur Narrow Neck BGPNNCT Average Cortical Thickness (cm) 13586 0.068-0.429 2830 88888 Blank but applicable 55-58 Femur Narrow Neck BGPNNDIS Profile center distance (cm) 13586 1.01-2.64 2830 8888 Blank but applicable 59-63 Femur Narrow Neck BGPNNCTR Center of Mass Position (dimensionless) 13586 0.395-0.625 2830 88888 Blank but applicable 64-68 Femur Narrow Neck BGPNNZ Section Modulus (cm3) 13586 0.491-5.914 2830 88888 Blank but applicable 69-74 Femur Narrow Neck BGPNNBR Buckling Ratio 13586 03.879-32.601 2830 888888 Blank but applicable NHANES III Bone Hip Geometry Data File ------------------------------------------------------------------------ Positions Item description SAS name Counts and code Notes ------------------------------------------------------------------------ 75-79 Femur Intertrochanter BGPITBMD Bone Mineral Density (g/cm2) 13615 0.359-2.098 2801 88888 Blank but applicable 80-85 Femur Intertrochanter BGPITCSA Cross Sectional Area (cm2) 13615 01.716-10.842 2801 888888 Blank but applicable 86-91 Femur Intertrochanter BGPITCSM Cross Sectional Moment of Inertia (cm4) 13615 03.185-41.808 2801 888888 Blank but applicable 92-95 Femur Intertrochanter BGPITWID Subperosteal Width (cm) 13615 4.01-7.68 2801 8888 Blank but applicable 96-100 Femur Intertrochanter BGPITED Endocortical Diameter (cm) 13615 003.1-7.022 2801 88888 Blank but applicable 101-105 Femur Intertrochanter BGPITCT Average Cordial Thickness (cm) 13615 0.124-0.855 2801 88888 Blank but applicable 106-109 Femur Intertrochanter BGPITDIS Profile center distance (cm) 13615 1.78-3.77 2801 8888 Blank but applicable NHANES III Bone Hip Geometry Data File ------------------------------------------------------------------------ Positions Item description SAS name Counts and code Notes ------------------------------------------------------------------------ 110-114 Femur Intertrochanter BGPITCTR Center of Mass Position (dimensionless) 13615 0.374-0.533 2801 88888 Blank but applicable 115-120 Femur Intertrochanter BGPITZ Section Modulus (cm3) 13615 01.349-11.179 2801 888888 Blank but applicable 121-126 Femur Intertrochanter BGPITBR Buckling ratio 13615 03.076-29.154 2801 888888 Blank but applicable 127-131 Femur Shaft BGPFSBMD Bone Mineral Density (g/cm2) 13615 0.529-2.771 2801 88888 Blank but applicable 132-136 Femur Shaft BGPFSCSA Cross Sectional Area (cm2) 13615 1.599-9.737 2801 88888 Blank but applicable 137-142 Femur Shaft BGPFSCSM Cross Sectional Moment of Inertia (cm4) 13615 01.287-16.107 2801 888888 Blank but applicable 143-146 Femur Shaft BGPFSWID Width (cm) 13615 2.17-5.08 2801 8888 Blank but applicable NHANES III Bone Hip Geometry Data File ------------------------------------------------------------------------ Positions Item description SAS name Counts and code Notes ------------------------------------------------------------------------ 147-151 Femur Shaft BGPFSED Endocortical Diameter (cm) 13615 0.375-4.303 2801 88888 Blank but applicable 152-156 Femur Shaft BGPFSCT Average Cortical Thickness (cm) 13615 0.168-1.293 2801 88888 Blank but applicable 157-160 Femur Shaft BGPFSDIS Profile center distance (cm) 13613 1.13-2.61 2803 8888 Blank but applicable 161-165 Femur Shaft BGPFSCTR Center of Mass Position (dimensionless) 13613 0.404-0.571 2803 88888 Blank but applicable 166-170 Femur Shaft BGPFSZ Section Modulus (cm3) 13613 0.931-6.943 2803 88888 Blank but applicable 171-176 Femur Shaft BGPFSBR Buckling ratio 13613 01.245-13.076 2803 888888 Blank but applicable