Page 69 - Age of onset of disruptive behavior of residentially treated adolescents -Sjoukje de Boer

8.53, p=.003). Many were nonresponders (i.e., failing to complete the SCL-90-R at discharge; 78.0% of the EO nonresponders dropped out versus 48.0% of the AO nonresponders). No significant difference was found in nonresponse between the EO group (32.5%) and the AO group (29.4%).
Mean change 4 To check for changes over time, the three cohorts of patients (i.e., those admitted between 1995-1998, 1999-2002, and 2003-2008) were compared on age at admission, number of previous admissions, length of treatment, and GSI at admission.
Of these variables only length of treatment showed significant changes over time: for
cohort 1995-1998, the length of treatment was 481 days; for cohort 1999-2002, it was
603 days; and for cohort 2004-2008, it was 443 days. The difference between the
middle and the last cohort was significant (F (2, 143) = 4.68, p=.011). The other
variables showed no significant differences, with F values ranging from 0.45 to 2.61.
Table 2
Comparison between T-scores of the total group on SCL-90-R total score at admission and discharge
n=145 Measurement SCL-90-R total score Admission Discharge
M (SD) t (df), p ES 152.14 (61.42) 2.51 (144), .007 .20 139.84 (61.01)
M = mean; SD = standard deviation; df = degree of freedom; SCL-90-R = Symptom Checklist 90 Revised; ES = Effect size (Cohen’s d)
Paired t-tests (one-tailed) for outcome results were performed for the total group (n=145). The differences in T-scores between admission (T1) and discharge (T2) on the GSI are shown in Table 2. The effect size (Cohen’s d) between T1 and T2 for the total score was small.
Next, a mixed between-within subjects ANOVA was conducted to assess outcome on the GSI for the EO and the AO groups between the two time periods (admission and discharge). There was no significant interaction between onset group and time period, Wilks Lambda = 1.00, F (1, 143) = .07, p=.80, partial eta squared = .000. There was a small main effect for time period, Wilks Lambda = .97, F (1, 143) =
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