Sex differences in the causes of self-control: An examination of mediation, moderation, and gendered etiologies

Sex is one of the most robust predictors of self-control, with a consistent finding that girls score higher on a variety of measures of self-control. In this research, we investigate three possible reasons for why this is true: first, we examine whether current predictors of self-control mediate the effect of sex on self-control, second, we examine whether sex moderates the effect of current predictors on self-control and third, we examine the possibility that the causes of self-control are gendered, necessitating different causal models for boys and girls. Using data from the Children of the National Longitudinal Survey of Youth79, we assess three, related questions: Is the sex effect on self-control mediated by current predictors of self-control? Does sex moderate the effects of current predictors of self-control? Does the causal model predicting self-control differ for boys and girls? We find that the sex effect on self-control is robust; does not moderate the etiology of self-control; and although partially mediated by etiological variables, remains a significant predictor of self-control. We also find that current predictors do a poor job of explaining girls’ acquisition of self-control, suggesting a gendered etiology of self-control.

Research Highlights
► Sex is a robust predictor of self-control.
► Supervision and physical punishment partially mediate the effect of gender on self-control.
► Sex does not moderate the effect of family, environmental and biological predictors on self-control.
► Traditional predictors of self-control do a poor job of modeling girls’ self-control.
► New, gender-specific, measures of self-control are proposed.