Characteristics of the participants in the two samples
| Full sample | n (%) | |
| Care as usual | ITC | |
| n=1717 | n=916 | |
| Sex | ||
| Girls | 838 (48.8) | 446 (48.7) |
| Boys | 879 (51.2) | 470 (51.3) |
| Concern | 70 (7.6) | |
| Speech | 50 (5.5) | |
| Subsample including children aged at least 24 months or referred early | ||
| n=1717 | n=650 | |
| Sex | ||
| Girls | 838 (48.8) | 314 (48.3) |
| Boys | 879 (51.2) | 336 (51.7) |
| Concern | 58 (8.9) | |
| Speech | 35 (5.4) | |
ITC, Infant-Toddler Checklist.