Table 1

The number of concordant, discordant monozygotic (MZ), and same sex dizygotic (DZ) twin pairs. Proband concordance rates and correlations in liability with 95% confidence intervals. Lifetime prevalence of migraine with aura in percentage

MalesFemalesOverall
MZDZMZDZMZDZ
No of pairs
 Concordant12101462616
 Discordant2148307051118
Proband concordance rate0.53  (0.35-0.71)0.29  (0.15-0.43)0.48  (0.32-0.64)0.15  (0.04-0.26)0.50  (0.38-0.62)0.21  (0.12-0.30)
Correlation in liability0.71 (0.50-0.92)0.32 (0.05-0.59)0.66 (0.46-0.86)0.11 (0.01-0.38)0.68 (0.54-0.82)0.22 (0.03-0.41)
Lifetime prevalence6.87.87.1