Reference intervals of small intestinal length by gestational age in subgroups of children (8-week partitions)
| Age category (wk) | Number | Lower limit (90% CI) | Upper limit (90% CI) |
| No congenital anomalies | |||
| 13–20 | 30 | 18.6 (6.7 to 31.2) | 120.5 (107.4 to 137.2) |
| 21–28 | 29 | 68.1 (48.9 to 86.2) | 215.7 (195.1 to 237.7) |
| 29–36 | 18 | 83.8 (27.4 to 131.1) | 335.0 (287.5 to 390.3) |
| 37–41 | 19 | 125.0 (79.1 to 169.3) | 417.5 (366.2 to 477.6) |
| No gastrointestinal anomalies | |||
| 13–20 | 37 | 23.5 (13.6 to 35.9) | 122.6 (109.4 to 135.5) |
| 21–28 | 40 | 60.2 (43.0 to 76.4) | 206.8 (188.4 to 226.5) |
| 29–36 | 18 | 80.1 (21.0 to 127.8) | 347.1 (301.6 to 403.6) |
| 37–41 | 19 | 119.8 (68.9 to 161.5) | 406.5 (347.8 to 461.0) |
| Not part of multiple pregnancy | |||
| 13–20 | 36 | 20.7 (9.0 to 31.6) | 126.7 (114.0 to 140.0) |
| 21–28 | 40 | 53.9 (34.9 to 71.1) | 206.9 (188.9 to 225.6) |
| 29–36 | 21 | 83.6 (30.6 to 128.2) | 337.1 (291.4 to 383.7) |
| 37–41 | 20 | 137.6 (89.8 to 177.8) | 410.1 (360.8 to 464.3) |
| Not large for gestational age | |||
| 13–20 | 41 | 20.8 (10.1 to 31.1) | 120.6 (109.7 to 134.6) |
| 21–28 | 47 | 57.7 (40.8 to 73.7) | 203.8 (188.2 to 220.6) |
| 29–36 | 19 | 89.8 (31.6 to 138.8) | 330.6 (283.1 to 376.0) |
| 37–41 | 20 | 126.1 (76.0 to 167.2) | 404.2 (352.7 to 456.9) |
| Absence of IUGR | |||
| 13–20 | 33 | 23.5 (11.6 to 34.6) | 126.4 (112.9 to 140.3) |
| 21–28 | 32 | 73.8 (55.5 to 90.2) | 212.2 (193.4 to 231.3) |
| 29–36 | 20 | 78.9 (23.8 to 126.7) | 341.5 (295.3 to 389.0) |
| 37–41 | 20 | 136.9 (88.9 to 175.9) | 410.6 (363.5 to 464.0) |
| Absence of maceration | |||
| 13–20 | 31 | 26.4 (14.7 to 37.9) | 120.3 (107.3 to 133.5) |
| 21–28 | 37 | 49.0 (28.3 to 66.4) | 205.5 (187.1 to 224.3) |
| 29–36 | 17 | 73.0 (8.4 to 129.8) | 355.5 (305.5 to 409.6) |
| 37–41 | 17 | 139.7 (97.7 to 175.9) | 378.0 (338.8 to 422.2) |
CI, Confidence interval; IUGR, intrauterine growth restriction.