Prevalence per 10 000 total birth (95% CI) of CHD in twins and singletons, according to CHD severity and chorionicity
| CHD severity | Twins | Singletons | ||
|---|---|---|---|---|
| Twins (any chorionicity) | Dichorionic twins | Monochorionic twins | ||
| All CHD | 129.7 (110.2 to 151.7) | 111.6 (90.5 to 136.1) | 202.8 (149.4 to 268.8) | 74.7 (72.1 to 77.4) |
| Severe CHD | 5.9 (2.4 to 12.2) | 4.6 (1.3 to 11.9) | 12.9 (2.7 to 37.8) | 3.3 (2.8 to 3.9) |
| Moderate CHD | 26.1 (17.8 to 37.0) | 29.1 (18.8 to 42.9) | 21.6 (7.0 to 50.3) | 17.8 (16.5 to 19.2) |
| Mild CHD | 89.3 (73.2 to 107.9) | 73.2 (56.3 to 93.6) | 151.1 (105.4 to 209.5) | 49.2 (47.1 to 51.5) |
CHD, congenital heart disease.