Skip to main content
. Author manuscript; available in PMC: 2013 Apr 29.
Published in final edited form as: Lung. 2011 Jun 10;189(4):323–330. doi: 10.1007/s00408-011-9306-3

Table 4.

Twin correlation coefficients adjusted for age, sex, and smoking

FEV1
r (95% CI)		 FVC
r (95% CI)		 PEF
r (95% CI)
Men
  MZ 0.60 (0.50–0.67) 0.52 (0.42–0.60) 0.49 (0.40–0.57)
  DZ 0.22 (0.11–0.33) 0.20 (0.09–0.32) 0.18 (0.06–0.29)
Women
  MZ 0.63 (0.55–0.69) 0.58 (0.50–0.65) 0.29 (0.17–0.40)
  DZ 0.26 (0.14–0.36) 0.18 (0.07–0.28) 0.16 (0.03–0.28)
DOS 0.32 (0.24–0.39) 0.22 (0.13–0.29) 0.11 (0.03–0.19)

MZ monozygotic twins, DZ same-sex dizygotic twins, DOS oppositesex dizygotic twins