This report is the second in a series of reports presenting analyses and discussion of data on body measurements performed in Cycle III of the Health Examination Survey. The method employed for the study, which involved physical examinations of youths at mobile examination centers at 40 preselected locations throughout the country, is described in detail. There is a description of the results which presents data comparing height, weight, stature, and sitting height with reference to age and race. The appendixes include 12 supportive statistical tables and statistical notes on the design of the study. (JA)