Page 99 - Age of onset of disruptive behavior of residentially treated adolescents -Sjoukje de Boer

disruptive behavior, cannabis usage prior to treatment, or duration of treatment. The non-responders did differ on discharge status: 27.1% of the completers did not participate at follow-up compared to 42.7% of the dropouts (χ2 (1, N=294) = 7.73; p=.005). Further analysis revealed that the difference between completers and dropouts was almost entirely caused by the pushouts (50.0% did not participate) and not by the withdrawals (non-participation rate of 36.5%).
Procedure
All inpatients admitted from the start of the facility in 1995 were approached to 6 participate in the study. The research was in accordance with Dutch medical ethical research regulation. Information gathered was handled according the regulation of the Personal Data Protection Act (Wet Bescherming Persoonsgegevens). After a personal description of the study to the subjects, written informed consent (asking for the use
of their information for research) was obtained according to legislation and the institution’s policy. All inpatients agreed to participate and in concordance with the institutional policy, they participated without receiving incentives or rewards. The data were used of those who had been discharged up to and including 2012 (N=294).
According to the study protocol (Bruinsma & Boon, 2001) the measurements were conducted within the first weeks of admission, and one and a half year after discharge (follow-up). Discharge status (i.e., completion and dropout) was determined shortly after discharge. The measurements were conducted by research assistants. These research assistants were psychology students in the final year of their master program, and were trained and supervised by the researcher.
Some of the data originated from patient interview, some was collected through file review and some by self-report instruments. The information was gathered on standardized forms used in the context of ongoing program evaluation research conducted at the facility.
In the first week of the admission, participants were interviewed on socio- demographic information (e.g., sex, age, ethnicity), substance usage (drugs and alcohol) and previous criminal offending. The period for which the information was collected was from birth to admission. To obtain an indication of the psychological functioning, in the first week of the admission and at discharge, participants filled in
97