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Table 2 The number of affected first- and second-degree relatives of index cases with familial polydactyly reported to the Polish Registry of Congenital Malformations, 1998-2007

From: Epidemiology of isolated preaxial polydactyly type I: Data from the Polish Registry of Congenital Malformations (PRCM)

Type of Familial Polydactyly Relatives Io Relatives IIo
Siblings Parents Grandparents Parents' siblings
Preaxial - PPD (N = 78) 15 (19.2%) 31 (39.7%) 16 (20.5%) 17 (21.8%)
 PPD1 (N = 57) 14 17 10 12
 PPD2 (N = 1) 0 1 1 0
 PPD3 (N = 5) 0 4 0 0
 PPD4 (N = 14) 1 9 4 5
 PPD1 + PPD2 (N = 1) 1 0 1 0
Postaxial (N = 148) 38 (25.7%) 77 (52.0%) 24 (16.2%) 40 (27.0%)
Unknown (N = 127) 39 (30.7%) 70 (55.1%) 21 (16.5%) 29 (22.8%)
Total (N = 353) 92 (26.1%) 178 (50.4%) 61 (17.3%) 86 (24.3%)