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| No of pairs | Monozygotic twins | Dizygotic twins | ||||
|---|---|---|---|---|---|---|
| Concordant (n = 17) | Discordant (n = 6) | Total (n = 23) | Concordant (n = 5) | Discordant (n = 45) | Total (n = 50) | |
| Mean age at diagnosis (y) | ||||||
| Index twin | 10.3 | 6.9 | 9.4 | 4.6 | 9.4 | 8.9 |
| Co‐twin | 11.3 | – | – | 12.1 | – | – |
| Mean age at enrolment (y) | 21 | 20.5 | 20.8 | 22.4 | 17.8 | 18.3 |
