Sons and daughters of parents in a support organization.

Earlier surveys of a parents' support organization revealed a 3:1 ratio of parents of sons to parents of daughters. Three possible explanations for this ratio were considered based on differential onset, behavioral differences, and marital status. A re-analysis of survey data indicated that the most reasonable explanation of the gender difference is the greater propensity for anti-social behavior on the part of sons, leading to increased parental needs for support and outside assistance.