Table 5.
HHS classification according to the hand malformations
| Type | Subtypea | ||
|---|---|---|---|
| a | b | % | |
| Type1 Thumb type (thumb hypoplasia, thumb duplication, triphalangeal thumb, et al) | 113 | 8 | 60.5% |
| Type2 Finger type (syndactyly, brachydactyly, symbrachydactyly, et al) | 45 | 8 | 26.5% |
| Type3 Contracture type (single or multiple congenital joint contractures) | 22 | 3 | 12.5% |
| Type4 Rare type (could not classify into malformations mentioned above) | 1 | 0 | 0.5% |
aSubtype a: an abnormal heart structure was discovered by ultrasonic cardiogram, associated with normal EGC or abnormal ECG. Subtype b: only abnormal result of ECG was discovered