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| Number of pregnant women | 787 |
| Maternal age (years) | 31.8±3.8 |
| Nullipara | 454 (57.7) |
| Twin pregnancy | 43 (5.5) |
| CHD in only one twin | 39 |
| CHD in both twins | 4 |
| Number of fetuses diagnosed with CHD | 791 |
| Gestational age at diagnosis of CHD (weeks) | 24.7±4.9 |
| Gestational age at delivery (weeks) (live birth only) | 37.8±2.5 |
Data are shown in number (%) or mean ± standard deviation.
CHD, congenital heart disease.
