Table 1.
Demographic summary of the autism and typically developing control groups
| Autism n=40 |
Typically Developing n=17 |
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|---|---|---|---|---|---|
|
| |||||
| Mean (sd) | Range | Mean (sd) | Range | t (p-value) | |
| Time 1 age (years) | 8.5 (3.1) | 3.5-12.9 | 9.0 (2.6) | 4.0-12.3 | 0.5 nsa |
| PIQb | 90 (20) | 50-128 | 120 (15) | 96-145 | 5.5 (<0.001) |
| VIQ | 90 (22) | 51-136 | 114 (15) | 91-151 | 4.0 (<0.001) |
| FSIQ | 86 (21) | 49-127 | 120 (16) | 95-153 | 5.9 (<0.001) |
| Handednessc | 73 (39) | −67-+100 | 79 (13) | +20-+100 | 0.4 ns |
| ADOS Severity Score | 7.9 (1.5) | 4-10 | --- | --- | --- |
| Interscan interval: | |||||
| Time 1 to 2 (years)d | 2.7 (0.7) | 2.0-6.5 | 2.6 (0.6) | 1.8-3.7 | 0.5 ns |
| Time 2 to 3 (years)e | 2.7 (0.5) | 2.0-4.2 | 2.6 (0.5) | 1.9-3.5 | 0.7 ns |
a
ns indicates p-value > 0.2;
b
autism: PIQ n=38, VIQ n=32, FSIQ n=39;
c
Edinburgh Handedness Inventory (Oldfield, 1971), ranging from −100, completely left handed, to +100, completely right handed;
d
autism n=38, control n=17;
e
autism n=26, control n=12.