. Author manuscript; available in PMC: 2014 Aug 8.

Published in final edited form as: Clin Dysmorphol. 2012 Oct;21(4):191–195. doi: 10.1097/MCD.0b013e328358243c

Table 2.

Pairwise and probandwise concordance rates for MZ and DZ twin pairs with the VATER/VACTERL association in the present cohort

	MZ twin pairs	DZ twin pairs	MZ/DZ ratio	P values^*
Pairwise concordance rate (95% CI)^a	15% (4–42%)	18% (5–48%)	0.83	0.53
Probandwise concordance rate (95% CI)^a	27% (11–52%)	31% (13–58%)	0.87	0.40

CI, confidence interval; DZ, dizygous; MZ, monozygous.

P values from the Fisher exact test to assess one-tailed P values.

Concordance rates (probandwise and pairwise) were calculated according to Allen et al. (1967).