Table 2.
Palmar flexion creases (PFCs) as a percentage of all palms for boys with ASD and typically developing boys.
| Hand | Pattern | ASD boys | Control boys | χ 2 | P value |
|---|---|---|---|---|---|
| Left | Normal | 100% (46) | 97.9% (47) | 0.97 | 0.33 |
| Simian | 0% (0) | 2.1% (1) | |||
| Sydney | 0% (0) | 0% (0) | |||
|
| |||||
| Right | Normal | 97.8% (45) | 93.8% (45) | 1.96 | 0.38 |
| Simian | 0% (0) | 4.2% (2) | |||
| Sydney | 2.2% (1) | 2.1% (1) | |||
|
| |||||
| Discordance between LH and RH | 2.2% (1) | 4% (2) | 0.30 | 0.58 | |
ASD = Autism Spectrum Disorders; LH = left hand; RH = right hand.
Exact counts of palms are in parentheses. Chi-square tests the hypothesis that there is no association between PFC patterns and group membership.