| Characteristics | All | Control | Intervention |
| Child N | 221 | 109 | 112 |
| Age, months: M (SD) | 65.28 (11.35) | 65.30 (10.90) | 65.26 (11.82) |
| Gender, male: n (%) | 137 (62.0) | 67 (61.5) | 70 (62.5) |
| Ethnicity, Caucasian: n (%) | 212 (95.9) | 103 (94.5) | 109 (97.3) |
| TSDQ total difficulties, M (SD) | 18.35 (4.59) | 18.37 (4.73) | 18.33 (4.47) |
| TSDQ above cut-offa, n (%) | 153 (69.2) | 76 (69.7) | 77 (68.8) |
| Teacher N | 56 | / | / |