Ratio of fetal small intestinal length to large intestinal length for lower and upper reference limits
| Age category (wk) | Number | Ratio of fetal small intestinal length to large intestinal length for lower reference limit | Ratio of fetal small intestinal length to large intestinal length for upper reference limit |
| 13–20 | 42 | 4.1 | 5.7 |
| 17–20 | 29 | 4.3 | 5.9 |
| 21–28 | 47 | 4.5 | 5.1 |
| 21–24 | 28 | 5.4 | 5.1 |
| 25–28 | 19 | 4.4 | 5.2 |
| 29–36 | 21 | 2.6 | 5.4 |
| 37–41 | 21 | 4.6 | 4.9 |
Bolded values represent collapsed age categories in this study and their associated fetal small intestinal length to large intestinal length ratios.