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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.