Significant differences were found between these groups in regard to their personal history and offending behaviors. One of the most significant findings from the original study was that the majority of the victims were older boys, as 6 percent of the offenders with two or more allegations of abuse were classified as pedophiles and 32 percent as ephebophiles, the latter which have a sexual interest in post-puberty males. The analysis conducted in this work also found differences between the two groups concerning the age of offender at first offense, the duration of the offending history, and substance abuse history. The article notes that the original study was conducted by the John Jay College of Criminal Justice, which was commissioned by the United States Conference of Catholic Bishops to conduct a national survey to determine the nature and extent of child sexual abuse by clergy. Using data collected in this survey, this study examined data not available in the original report concerning factors that differentiated between pedophile and ephebophile offenders. Data were derived from the original study of Catholic clergy in the United States which analyzed surveys from 4,392 clerics and 10,677 victims. Table and references