| Count of visible fetal abnormalities detected by US | N (/1000) |
| 7 | 1 (0.5) |
| 6 | 2 (0.9) |
| 5 | 2 (0.9) |
| 4 | 22 (10.4) |
| 3 | 31 (14.6) |
| 2 | 49 (23.1) |
| 1 | 71 (33.5) |
| None detected | 1942 (916) |
| Total | 2120 (1000) |