15581-m-nanninga

PROBLEMS AT ENTRY, CARE RECEIVED, OUTCOMES 111 respondents, 666 participated (70.3%). Differences between respondents and non- respondents were small regarding age, gender, degree of urbanization, and psychosocial problems, with effect sizes ranging from 0.02 (psychosocial problems) to 0.08 (degree of urbanization) [8]. Children who had had contact with psychosocial care in the past six months were excluded. This resulted in a reference cohort of 443 participants. Data were obtained from parents/caregivers and adolescents via web-based or paper questionnaires at three moments. If required, we provided assistance in filling out the questionnaire. The baseline measurement (T1) followed directly after entry into the study, which was, for the care cohort, at the moment of the child’s enrolment. The second (T2) and third (T3) questionnaires were sent 3 and 12 months after the first questionnaire, respectively. The loss to follow-up at T2 and T3 was 6.9% and 8.8% for the care cohort and 2.0 and 2.2% for the reference cohort, respectively [8].