Table 1

Sample description of the 47 twin pairs analysed

Monozygotic twin pairsDizygotic twin pairs
No of pairsConcordant 15Discordant 5Total 20Concordant 3Discordant 24Total 27
95% CI, 95% confidence interval.
Probandwise concordance85.720.0
    (95% CI)(73.3–98.1)(0.8–39.2)
Pairwise concordance75.011.1
    (95% CI)(62.0–94.0)(9.9–23.0)