| Baseline | T2 | T3 | |||||||
| Mean | SD | n | Mean | SD | n | Mean | SD | n | |
| Advancing adolescence | 8.20 | 1.72 | 462 | 8.48 | 1.62 | 299 | 8.24 | 1.59 | 160 |
| Waiting list | 8.17 | 1.77 | 354 | 8.36 | 1.64 | 233 | 8.52 | 1.44 | 140 |
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