| Any positive visible fetal abnormality detected by US | Total | ||
| Negative (no abnormality noticed) | Positive (abnormal) | ||
| N (%) | N (%) | N (%) | |
| Age group (years) | |||
| <20 | 113 (91.9) | 10 (8.1) | 123 (100) |
| 20 - 29 | 1008 (91.8) | 90 (8.2) | 1098 (100) |
| 30 - 39 | 711 (90.9) | 71 (9.1) | 782 (100) |
| 40+ | 110 (94) | 7 (6) | 117 (100) |