Aggression and rule-breaking: Heritability and stability of antisocial behavior problems in childhood and adolescence

Purpose

This twin study examined the structure of genetic and environmental influences on aggression and rule-breaking in order to examine change and stability across the span of childhood to mid-adolescence.

Methods

Behavioral assessments were conducted at two time points: age 9–10 years and 14–15 years. Using behavioral genetics biometric modeling, the longitudinal structure of influences was investigated.

Results

Aggression and rule-breaking were found to be influenced by a latent common factor of antisocial behavior (ASB) within each wave of data collection. The variance in the childhood-age common factor of ASB was influenced by 41% genetics, 40% shared environment and 19% nonshared environment. In adolescence, 41% of variance in the common factor were novel and entirely genetic, while the remainder of variance was stable across time. Additionally, both aggression and rule-breaking within each wave were found to have unique influences not common across subscales or across waves, highlighting specificity of genetic and environmental effects on different problem behaviors at both ages.

Conclusions

This research sheds light on the commonality of influences on different forms of antisocial behavior. Future research into interventions for antisocial behavior problems in youth could focus on adolescence-specific environmental influences.     

Novel Classification System of Rib Fractures Observed in Infants

Rib fractures are considered highly suspicious for nonaccidental injury in the pediatric clinical literature; however, a rib fracture classification system has not been developed. As an aid and impetus for rib fracture research, we developed a concise schema for classifying rib fracture types and fracture location that is applicable to infants. The system defined four fracture types (sternal end, buckle, transverse, and oblique) and four regions of the rib (posterior, posterolateral, anterolateral, and anterior). It was applied to all rib fractures observed during 85 consecutive infant autopsies. Rib fractures were found in 24 (28%) of the cases. A total of 158 rib fractures were identified. The proposed schema was adequate to classify 153 (97%) of the observed fractures. The results indicate that the classification system is sufficiently robust to classify rib fractures typically observed in infants and should be used by researchers investigating infant rib fractures.     

The Cross-Cultural Association Between Marital Status and Physical Aggression Between Intimate Partners

Some research suggests that the risk of physical aggression by an intimate partner is related to marital status, but this relationship may vary across cultures and by gender. In the present study, we systematically examine the relationship between marital status and physical partner aggression by gender across 19 countries. Logistic and multilevel regression confirmed previous findings of lower rates of physical aggression for legally married versus cohabiting and separated/divorced women and men across most, but notably, not all countries. Single status was associated with higher risk in some countries and lower in others reflecting possible cultural differences in risk for different marital statuses. For example, single women had significantly lower rates of victimization than did married women in India where violence against wives is often accepted. The variation in the cross-cultural findings highlights the importance of examining both men and women and considering the cultural context when interpreting the relationship between partner aggression and marital status.     

Sex Trafficking and Moral Harm: Politicised Understandings and Depictions of the Trafficked Experience

This paper explores notions of harm in sex work discourse, highlighting the extent to which essentialist ideas of ‘good’ versus ‘bad’ sex have pervaded trafficking policy. In a comparative examination of Australian Parliamentary Inquiries and United States congressional hearings leading to the establishment of anti-trafficking policy, we identify the stories that have influenced legislators, and established a narrative of trafficking heavily dependent upon assumptions of the inherent harm of sex work. This narrative constructs a hierarchy of victimisation, which denies alternative discourses of why women migrate for sex work. We argue that it is not sexual commerce that is harmful, but pathological, systemic inequalities and entrenched disadvantage that are harmful. A narrow narrative of trafficking fails to adequately depict this complexity of the trafficked experience.     

Fatal positional asphyxia associated with rollover crashes

Motor vehicle rollover crashes result in complex occupant kinematics with the potential for severe injury. Five cases of fatal asphyxia in occupants suspended from their safety belt upside down after a rollover crash are presented. These fatalities accounted for 13.5% of all motor vehicle related asphyxia deaths in San Diego County over a 10-year period. This study supports previous research noting that incapacitation due to other injuries, alcohol, or obesity may be associated with fatal positional asphyxia due to inversion during rollovers. Safety belts are proven to prevent serious injury in motor vehicle crashes and should always be worn. However, redesign of the buckle could be considered to permit easier release by an occupant. We also suggest that pre-existing heart disease may contribute to the possibility of a fatal asphyxia outcome. Although this is a rare cause of motor vehicle related death, our results suggest that these are potentially preventable deaths.     

Men’s Avoidance Coping and Female Partner’s Drinking Behavior: A High-Risk Context for Partner Violence?

The current study explored whether men's avoidance coping in response to the drinking behavior of their female partner with an alcohol use disorder (AUD) would be associated with higher levels of men's perpetration of intimate partner violence (IPV). Women with an AUD (n = 109) and their male partners in a U.S. urban area were assessed on men's perpetration of minor and severe violence using the Conflict Tactics Scale, men's avoidance coping using the Spouse Behavior Questionnaire, and men's and women's drinking behavior using the Time Line Follow Back Interview. Using multiple regression analysis, results showed that men's use of avoidance coping significantly predicted male IPV perpetration over and above the women's perpetration of violence toward him, while women's alcohol use did not significantly predict male-to-female IPV perpetration. Implications for teaching emotion-regulation strategies to male partners of women with an AUD to cope with partner drinking are discussed.