| Number of planned scans | Proportion of pregnancies (%) | Median gestational age at scan (weeks) | Antenatal detection of SGA birthweight (%) |
|---|---|---|---|
| 0 | 20.9 | - | - |
| 1 | 4.6 | 32 | 30.1 |
| 2 | 22.7 | 28 34 | 32.1 |
| 3 | 29.2 | 28 32 36 | 48.8 |
| 4 | 14.4 | 28 32 35 37 | 76.1 |
| 5 | 6.1 | 28 30 32 35 37 | 84.1 |
| 6+ | 2.0 | 28 30 32 34 36 38 | 93.1 |