**4.2 General and demographic information about the adolescent**

Patient code (control variable consisting of initials of the adolescent, confidential), date of birth (dd-mm-yy), gender, living area (first two numbers of postal code), daily occupation (educational level, work), school performance (normal, repeating of a class, dropout), family situation (traditional, foster parents, living alone), siblings (none, brother[s], sister[s], both), position to siblings (oldest, middle, youngest), cultural background (Dutch, Moroccan, Turkish, Surinamese, Antillean, other), religious background (none, Roman Catholic, Protestant Christian, Jewish, Muslim, Hindu, Buddhist, other), and adolescent registration to medical or aid agencies (none, pediatrician, psychologist, other professional, mental health care institution, The Netherlands Youth Institute, other).
