Volume IV is meant to be read in conjunction with the NHES:1999 Data File User's Manual, Volume I. More information about the purpose of the study, the sample design, the other survey components, the data collection instruments, and data collection and data processing procedures is contained in the NHES:1999 Data File User's Manual, Volume I. Information about the Parent Interview public data file and the Youth Interview public data file can be found in Volumes II and III of the manual, respectively.
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