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)
From: Infant head growth in male siblings of children with and without autism spectrum disorders
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 |