Table 3.
Comparison of mean head growth, in cm./month (SD) for specified intervals, between male subjects with Autistic Disorder, PDD-NOS/Asperger Disorder, unaffected siblings of ASD probands, and unrelated controls. Analysis (one-way ANOVA) includes only those subjects with actual measurements at the beginning and end of each interval (i.e. not extrapolated from growth curves defined by measurements at other time points)
| Birth-6 months | 6–12 months | 12–18 months | |
|---|---|---|---|
| Autistic disorder | 1.68 (.17) | .51 (.13) | .28 (.13) |
| PDD-NOS/Asperger disorder | 1.63 (.28) | .53 (.13) | .20 (.09) |
| Unaffected sibs of ASD probands | 1.55 (.27) | .56 (.13) | .31 (.06) |
| Control siblings | 1.51 (.18) | .49 (.11) | .24 (.08) |
| F | 2.78 | 2.44 | 2.55 |
| df | 3,121 | 3,172 | 3,86 |
| p | .04 | .07 | .06 |
| 2000 CDC norms | 1.26 | 0.41 | 0.23 |