Minor physical anomalies and family adversity as risk factors for violent delinquency in adolescence

Objective: Minor physical anomalies are considered indicators of disruption in fetal development. They have been found to predict behavioral problems and psychiatric disorders. This study examined the extent to which minor ph ysical anomalies, family adversity, and their interaction predict violent a nd nonviolent delinquency in adolescence. Method: Minor physical anomalies were assessed in a group of 170 adolescent boys from low socioeconomic status neighborhoods of Montreal. The boys had been enrolled in a longitudinal study since their kindergarten year, when an assessment of family adversity had been made on the basis of familial st atus and the parents' occupational prestige, age at the birth of the first child, and educational level. Adolescent delinquency was measured by using self-reported questionnaires and a search of official crime records. Results: Results from logistic regression analyses indicated that both the total count of minor physical anomalies and the total count of minor physic al anomalies of the mouth were significantly associated with an increased r isk of violent delinquency in adolescence, beyond the effects of childhood physical aggression and family adversity. Similar findings were not found f or nonviolent delinquency. Conclusions: Children with a higher count of min or physical anomalies, and especially a higher count of anomalies of the mo uth, could be more difficult to socialize for different and additive reason s: they may have neurological deficits, and they may have feeding problems in the first months after birth. Longitudinal studies of infants with minor physical anomalies of the mouth are needed to understand the process by wh ich they fail to learn to inhibit physical aggression.