Number of observations in relation to gestational age. Mean length of the pericallosal artery (millimeter) in relation to gestational age (±SD)
| Gestational Age (wk) | Fetuses (No.) | Mean Length of Pericallosal Artery (mm) | SD |
|---|---|---|---|
| 11 | 3 | 4.43 | 0.78 |
| 12 | 13 | 4.1 | 0.44 |
| 13 | 10 | 6.3 | 1.22 |
| 14 | 11 | 6.96 | 0.66 |
| 15 | 5 | 7.75 | 1.08 |
| 16 | 11 | 9.68 | 1.48 |
| 17 | 9 | 12.34 | 2.19 |
| 18 | 9 | 13.15 | 1.7 |
| 19 | 7 | 15.66 | 1.43 |
| 20 | 9 | 16.82 | 1.8 |
| 21 | 2 | 20.55 | 2.86 |
| 22 | 1 | 18.43 | 0.36 |