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NHANES 1999-2000 Subsample Notes and Data For several NHANES 1999-2000 files, data were collected or processed on a smaller sample (subsample) of individuals. Each of these subsamples is a nationally representative sample. For each subsample, the analytic sample size is smaller and appropriate sample weights have been calculated to reflect both the additional stage of sampling and the additional nonresponse (if any) for the subsample. These weights differ from the full examination weight and the revised weights must be used for statistical estimation. For each data file, the appropriate sample weights are included on the file along with the appropriate replicate weights needed for sampling error estimation. A common processing error is to use either the wrong sampling weight or to use the wrong set of replicate weights. Due to smaller sample sizes, the sampling errors for subsamples will be larger than for comparable data items on the full examination sample. Also, the potential impact of outliers (large data values especially in conjunction with large sampling weights) should be addressed in any analysis of these data – especially when the prevalence is less than 10 percent. Please note that when merging full sample data items to the subsample data files, the analytic sample is the subsample and the subsample weights must be used. Users are strongly urged to read the data file documentation and to take care to ensure proper analysis and interpretation of the data. Examination Files Audiometry [Codebook, Doc, Freqs, Data] (Updated June 2005) Balance [Codebook, Doc, Freqs, Data] (Updated June 2005) Composite International Diagnostic Interview (Generalized Anxiety Disorder) [Codebook, Doc, SAS Code, Freqs, Data] (Updated March 2006) Composite International Diagnostic Interview (Major Depression Module) [Codebook, Doc, SAS Code, Freqs, Data] (Updated March 2006) Composite International Diagnostic (Interview Panic Disorder Module) [Codebook, Doc, SAS Code, Freqs, Data] (Updated March 2006) Laboratory Files PHPYPA Urinary Phthalates [Codebook, Doc, Freqs, Data] (Updated July, 2005) Lab 06HM Heavy Metals [Codebook, Doc, Freqs, Data] (Updated July, 2005) Lab 10AM Plasma Glucose [Codebook, Doc, Freqs, Data] (Updated April 2005) Lab 13AM Triglycerides [Codebook, Doc, Freqs, Data] (Updated June, 2005) Lab 18T4 Thyroid-Stimulating Hormone and Thyroxine [Codebook, Doc, Freqs, Data] (Updated July, 2005) Lab 21 Volatile Organic Compounds [Codebook, Doc, Freqs, Data] (Updated July, 2005) Lab 26 Pesticides [Codebook, Doc, Freqs, Data] (Updated July, 2005) Lab 28 Dioxins [Codebook, Doc, Freqs, Data] (Updated December, 2005)
This page last reviewed
October 15, 2008
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