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
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%) |