Table 1.
Distribution of age, sex, and IQ for each study group
| Mean | SD | Range | Total | ||
|---|---|---|---|---|---|
| Age (in y) | ASD | 11.24 | 3.10 | 5–17 | 76 |
| Siblings* | 10.53 | 3.25 | 6–17 | 78 | |
| Controls | 11.77 | 3.01 | 6–17 | 99 | |
| IQ, SON | ASD | 108.68 | 16.03 | 80–140 | 75 |
| Siblings | 109.75 | 12.36 | 82–135 | 77 | |
| Controls | 112.19 | 12.53 | 86–140 | 99 | |
| IQ, CFT | ASD | 105.16 | 13.88 | 70–145 | 68 |
| Siblings | 104.55 | 10.65 | 85–142 | 73 | |
| Controls | 106.71 | 10.96 | 85–133 | 97 | |
| Male | Female | Ratio (M/F) | Total | ||
| (% total) | (% total) | ||||
| Sex | ASD | 64 (84.2) | 12 (15.8) | 5.33 | 76 |
| Siblings*+ | 33 (42.3) | 45 (57.7) | 0.733 | 78 | |
| Controls | 77 (77.8) | 22 (22.2) | 3.50 | 99 |
Abbreviations: ASD autism spectrum disorder, SD standard deviation, SON Snijders-Oomen Non-Verbal Intelligence Test 5.5-17, CFT Culture Fair Test, M Male, F Female.
Statistical analysis was conducted using χ2 tests. *p < .05 versus controls; +p < .05 versus ASD.