Table 2.

Prevalence of polydactyly and syndactyly by subtypes

Types	n	Prevalence (‰,95%CI)
Polydactyly	1888	2.23(2.13–2.33)
Hand polydactyly	1597	1.88(1.79–1.98)
Foot polydactyly	343	0.40(0.36–0.45)
Syndactyly	626	0.74(0.68–0.80)
Hand syndactyly	342	0.40(0.36–0.45)
Foot syndactyly	320	0.38(0.34–0.42)

Note 52 cases were polydactyly of both hand and foot, and 36 cases were syndactyly of both hand and footAbbreviations CI = confidence interval