Incidence is:::: "all types of polydactyly to be 2.3 per 1000 in white males, 0.6 per 1000 in white females, 13.5 per 1000 in black males, and 11.1 per 1000 in black females. The Swedish data alone showed polydactyly of all types to have an incidence of 1.0 per 1000, equally distributed between males and females." See: http://emedicine.medscape.com/article/1113584-overview#a0199
Answered 5/30/2015
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