Male-female differences in left-handedness in Sardinia, Italy.

Males were consistently found to be more likely than females to report left-hand preference in single-hand tasks, but the literature reports negative results too. Using data from a large sample in Sardinia, we aimed at testing the links of left-handedness with sex, age, residence, and seasonality of birth. A total of 4239 participants (males = 1589; females = 2650) were recruited in public places such as high schools, university classes, or gyms in one of the major islands of Italy. Hand preference was established with the question: Which hand do you normally use to write legibly? The monthly distribution of births was studied with the Rayleigh test. In the sample, 270 female participants reported left-hand preference in writing (10.2%) versus 161 male participants (10.1%). Left-hand preference in writing was negatively related to age, with increasing left-hand preference in the younger generations. Left-hand preference in writing was not more common in urban than in suburban or rural settings. The month of birth was found to have a seasonal effect on the left-handed (p=.031) but not on the right-handed (p=.80) participants, and this seasonal effect was more evident in males (p=.04) than in females (p =.26). In our sample males were not more likely to report left-hand preference in writing than females. On the other hand, left-hand preference does vary by age and, in all likelihood, this is an effect of the reduced cultural pressure to write with the right hand in the younger generations.

Sexual abuse and eating disorder symptoms: the mediator role of bodily dissatisfaction.

OBJECTIVE: The relationship between sexual abuse and eating disorders remains controversial; the role of intervening variables has often been neglected in past research. This study aimed at investigating the role of bodily dissatisfaction as a mediator effect on the impact of sexual abuse and the reporting of eating disorder symptoms. METHOD: In a community sample of 126 young women aged 18 to 30 years, we investigated the links between sexual abuse and eating disorders by means of self-compiled measures, including the Eating Attitudes Test, the Bulimic Investigatory Test of Edinburgh, the Body Attitudes Test (BAT), and the revised Hopkins Symptom Checklist (SCL-90-R). RESULTS: Those who reported sexual abuse in childhood scored higher at the Eating Attitudes Test, the Bulimic Investigatory Test of Edinburgh, and the BAT, compared with those who denied sexual abuse or experienced sexual abuse at an age after puberty. The experience of bodily dissatisfaction, as measured by the BAT, acted as an intervening variable (mediator) between sexual abuse in childhood and eating disorder symptoms. CONCLUSION: Although caution is required when reading the conclusions that could be drawn from self-reported measures, sexual abuse before puberty could be considered as a risk factor for the development of eating disorder symptoms, inducing revulsion about the body in ways that may intermix with concerns about body shape, size, and weight.