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This study is based chiefly upon the sexual case histories obtained by interviewing 1,356 white males who had been convicted for one or more sex offenses (our total sex-offender group); 888 white males who had never been convicted for a sex offense, but who had been convicted for some other misdemeanor or felony (our prison group); and 477 white males who had never been convicted for anything beyond traffic violations (our control group).

The interviews were not done at a uniform rate throughout die history of our research, and there were periods when interviewing was not only emphasized, but was directed toward specific groups. There were two major periods when we interviewed sex offenders: between 1941 and 1945 we gathered some 38 per cent of our sex-offender sample, chiefly in Indiana; and between 1953 and 1955, in California prisons, we gathered 45 per cent. The prison group also has an “Indiana phase” of 1940-1941 during which we obtained 37 per cent of our sample, and a “California phase” of 1953-1955 from which came 32 per cent of the sample. The growth of the control group was more; evenly spread: one fifth or nearly one fifth of the sample was gathered in each of the following two-year periods, 1940-1941, 1944-1945, 1948-1949, and 1959-1960. During the last period we made a special effort to enlarge and improve the sample for use in the present study.

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