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Patient characteristics of the 47 twin pairs analysed
| Monozygotic twin pairs | Dizygotic twin pairs | |||||
| Concordant (n=15) | Discordant (n=5) | Total (n=20) | Concordant (n=3) | Discordant (n=24) | Total (n=27) | |
| Mean age (y): | ||||||
| At enrolment | 19.6 | 17.2 | 19.0 | 16.0 | 14.5 | 14.7 |
| At onset in the index twin | 6.8 | 7.8 | 2.3 | 4.9 | ||
| At onset in the 2nd twin | 9.6 | — | 3.7 | |||
| Time elapsed to the onset of CD in the 2nd twin | 1.3 | — | — | 2.4 | — | — |
| Male/male pairs | 5 | 1 | 6 | 0 | 8 | 8 |
| Female/female pairs | 10 | 4 | 14 | 1 | 6 | 7 |
| Opposite sex pairs | — | — | — | 2 | 10 | 12 |
