Table 3.
Prevalence of polydactyly and syndactyly by sex
| Types | Male (N: 448,288) | Female (N: 399,368) | OR(95%CI) (Reference: females) | ||
|---|---|---|---|---|---|
| n | Prevalence (‰,95%CI) | n | Prevalence (‰,95%CI) | ||
| Polydactyly | 1213 | 2.71(2.55–2.86) | 674 | 1.69(1.56–1.82) | 1.60(1.46–1.76) |
| Hand polydactyly | 1044 | 2.33(2.19–2.47) | 552 | 1.38(1.27–1.50) | 1.69(1.52–1.87) |
| Foot polydactyly | 198 | 0.44(0.38–0.50) | 144 | 0.36(0.30–0.42) | 1.23(0.99–1.52) |
| Syndactyly | 377 | 0.84(0.76–0.93) | 249 | 0.62(0.55–0.70) | 1.35(1.15–1.58) |
| Hand syndactyly | 210 | 0.47(0.41–0.53) | 132 | 0.33(0.27–0.39) | 1.42(1.14–1.76) |
| Foot syndactyly | 183 | 0.41(0.35–0.47) | 137 | 0.34(0.29–0.40) | 1.19(0.95–1.49) |
Abbreviations N = number of births; CI = confidence interval; OR = odds ratio