Table 1. Child characteristics of the autism spectrum disorder (ASD) sample and community sample.
| ASD-sample N = 159 | Community sample N = 3127 | |
| Percentage (N) | Percentage (N) | |
| Gendera * | ||
| boys | 79.2 (126) | 50.0 (1564) |
| girls | 20.8 (33) | 49.1 (1535) |
| Mean (SD) | Mean (SD) | |
| Age (months)* | 31.8 (6.4) | 23.7 (0.7) |
| BITSEA Problem scale score* | 20.5 (8.7) | 7.8 (5.3) |
| BITSEA Competence scale score* | 10.0 (4.0) | 17.5 (3.0) |
| BITSEA Autism score* | 14.6 (5.2) | 4.1 (3.3) |
a. Percentages do not sum to 100% due to missing values.
* Significant differences in composition between ASD-sample and community sample with regard to gender, and age and mean Problem scale score, Competence scale score, and Autism score, p<0.001.