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Table 3 Casewise concordance rates by zygosity and heritability estimates of the four traits

From: A common genetic factor underlies hypertension and other cardiovascular disorders

  twin type total pairs discordant pairs (+/-) concordant pairs with trait (+/+) casewise concordance (95% CI) heritability (95% CI)
HPT MZ 525 73 29 0.44 (0.34–0.55) 0.64 (0.49–0.79)
  DZ 577 135 23 0.25 (0.17–0.34)  
RP MZ 525 75 18 0.32 (0.21–0.44) 0.46 (0.30–0.63)
  DZ 577 111 10 0.15 (0.07–0.24)  
MIG MZ 525 144 60 0.46 (0.38–0.53) 0.43 (0.30–0.55)
  DZ 577 186 40 0.30 (0.23–0.37)  
CAD MZ 525 55 8 0.23 (0.10–0.35) 0.34 (0.13–0.55)
  DZ 577 72 2 0.05 (0.00–0.12)  
  1. Casewise concordance rates (95% confidence intervals, CI) are shown for each trait by zygosity. An estimate of trait heritability (95% CI) is also given.
  2. HPT represents hypertension, RP Raynaud's phenomenon, MIG migraine, CAD coronary artery disease.