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Number of twins from twin pairs (N=207) with at least one twin affected by an isolated oral cleft
| Cleft twin population (1936–2004) | ||||
|---|---|---|---|---|
| Phenotype | Monozygotic (%) |
Dizygotic (%) |
Unknown zygosity (%) |
All zygosities |
| Cleft lip | 20 (27) | 39 (53) | 15 (20) | 74 |
| Cleft lip with cleft palate | 12 (12) | 68 (68) | 20 (20) | 100 |
| Cleft palate | 8 (14) | 34 (62) | 13 (24) | 55 |
| No oral cleft | 20 (11) | 131 (71) | 34 (18) | 185 |
| All | 60 (14) | 272 (66) | 82 (20) | 414 |
