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Table 1 Laterality of limb defects in sporadic preaxial polydactyly type I (PPD1), Polish Registry of Congenital Malformations, 1998-2007

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

Characteristic Sporadic PPD1 N = 459
Thumb Hallux
N = 435 P-value N = 24 P-value
Unilateral 405   21  
 Left 157 (38.8%) <0.0001 15 (71.4%) 0.08 (NS)
 Right 248 (61.2%) 6 (28.6%)
Bilateral 18   3  
Unknown 12   0  
  1. Statistical significance of exact test for proportion R:L ratio = 1.
  2. NS: Not significant.