Predicted mean corpus callosum length in weeks with 95% CI on the mean and for an individual measurement by gestational agea
| EGA (weeks) | No. (total = 68) | Lower 95% CI (Individual) (mm) | Lower 95% CI (of Mean) (mm) | Predicted Mean CC Length (mm) | Upper 95% CI (of mean) | Upper 95% CI (Individual) (mm) |
|---|---|---|---|---|---|---|
| 18 | 3 | 9.4 | 13.6 | 16.5 | 19.4 | 23.7 |
| 19 | –b | 11.8 | 16.4 | 18.8 | 21.2 | 25.8 |
| 20 | 5 | 14.1 | 18.9 | 21.0 | 23.0 | 27.8 |
| 21 | –b | 16.2 | 21.3 | 23.0 | 24.7 | 29.8 |
| 22 | –b | 18.3 | 23.5 | 25.0 | 26.5 | 31.7 |
| 23 | 3 | 20.2 | 25.5 | 26.9 | 28.2 | 33.6 |
| 24 | –b | 22.0 | 27.4 | 28.7 | 29.9 | 35.3 |
| 25 | 3 | 23.7 | 29.1 | 30.3 | 31.6 | 37.0 |
| 26 | 1 | 25.3 | 30.7 | 31.9 | 33.2 | 38.6 |
| 27 | 6 | 26.8 | 32.2 | 33.4 | 34.7 | 40.1 |
| 28 | 4 | 28.2 | 33.6 | 34.8 | 36.1 | 41.5 |
| 29 | 3 | 29.5 | 34.9 | 36.1 | 37.3 | 42.8 |
| 30 | 4 | 30.7 | 36.2 | 37.4 | 38.5 | 44.0 |
| 31 | 3 | 31.8 | 37.4 | 38.5 | 39.5 | 45.1 |
| 32 | 4 | 32.9 | 38.5 | 39.5 | 40.5 | 46.1 |
| 33 | 7 | 33.8 | 39.5 | 40.4 | 41.4 | 47.0 |
| 34 | 8 | 34.6 | 40.3 | 41.3 | 42.2 | 47.9 |
| 35 | 5 | 35.3 | 40.9 | 42.0 | 43.1 | 48.6 |
| 36 | 4 | 35.9 | 41.3 | 42.6 | 44.0 | 49.3 |
| 37 | 5 | 36.4 | 41.5 | 43.2 | 44.9 | 49.9 |
a For example, CC length for a fetus of 28 weeks should range from 28.2 to 41.5 mm, with the mean length falling within the range of 33.6–36.1 mm with 95% confidence.
b n = 0; values are interpolated.