| Intervention condition (N = 66) | Control condition (N = 64) |  |  | ||
---|---|---|---|---|---|---|
Adolescent-rated | M | SD | M | SD | z value | p |
 CDI-2:C T0 | 18.66 | 4.21 | 18.42 | 4.54 | .41 | .679 |
 CDI-2:C T1 | 16.18 | 4.92 | 15.68 | 7.08 | .45 | .655 |
 CDI-2:C T2 | 13.32 | 7.07 | 14.71 | 9.06 | − .80 | .423 |
 CDI-2:C T3 | 12.10 | 6.85 | 13.72 | 8.72 | − .98 | .326 |
 CDI-2:C T4 | 10.78 | 7.05 | 13.32 | 7.50 | − 1.98 | .048 |
Parent-rated | (N = 60) | (N = 59) |  |  | ||
 CDI-2:P T1 | 20.14 | 5.54 | 16.78 | 5.86 | 2.57 | .010 |
 CDI-2:P T2 | 18.66 | 6.00 | 15.09 | 6.36 | 2.96 | .003 |
 CDI-2:P T3 | 17.42 | 6.27 | 14.41 | 6.21 | 2.94 | .003 |
 CDI-2:P T4 | 16.59 | 6.34 | 14.07 | 6.53 | 2.10 | .035 |