IndIvIdual dIfferences In borderlIne personalIty traIts a genetIc perspectIve

t he effect of non-response on health and lifestyle measures has received extensive study, showing at most relatively modest effects. Nonresponse bias with respect to personality has been less thoroughly investigated. The present study uses data from responding individuals as a proxy for the missing data of their nonresponding family members to examine the presence of nonresponse bias for personality traits and disorders as well as health and lifestyle traits. We looked at the Big Five personality traits, borderline personality disorder (BPD) features, attentiondeficit/hyperactivity disorder, anger, and several measures of health (body mass index, migraine) and lifestyle (smoking, alcohol use). In general, outcomes tend to be slightly more favorable for individuals from highly cooperative families compared to individuals from less cooperative families. The only significant difference was found for BPD features (p = 0.001). However, the absolute difference in mean scores is very small, less than 1 point for a scale ranging from 0 to 72. In conclusion, survey data on personality, health and lifestyle are relatively unbiased with respect to nonresponse. ps marijn distel.indd 44 05/08/09 11:14:12 45 PERSONALITY, HEALTH AND LIFESTYLE IN A QUESTIONNAIRE FAMILY STUDY: A COMPARISON BETWEEN HIGHLY COOPERATIVE AND LESS COOPERATIVE FAMILIES