Table 3.
Differences between boys and girls stratified for left and right kidney structures. Differences between boys and girls were compared by independent-samples t-tests. Values are means (95% range)
| Kidney measurement | Left kidney | Right kidney | ||||
|---|---|---|---|---|---|---|
| Boys | Girls | P | Boys | Girls | P | |
| Gestational age 30 weeks | (n = 604) | (n = 553) | (n = 603) | (n = 556) | ||
| Length (mm) | 39.5 (32.0–47.0) | 38.4 (32.7–45.0) | <0.001 | 39.6 (32.0–46.6) | 38.5 (32.2–45.3) | <0.001 |
| Width (mm) | 21.6 (17.0–28.0) | 21.1 (16.5–26.0) | 0.001 | 22.4 (17.0–28.0) | 22.0 (17.0–27.6) | 0.02 |
| Depth (mm) | 22.7 (17.0–29.0) | 22.1 (17.9–27.8) | 0.001 | 23.2 (17.8–30.0) | 22.9 (18.0–29.0) | 0.03 |
| Volume (cm3) | 10.3 (5.4–17.9) | 9.5 (5.4–15.0) | <0.001 | 11.0 (5.8–18.5) | 10.3 (5.8–16.8) | <0.001 |
| Age 6 months | (n = 375) | (n = 358) | (n = 379) | (n = 368) | ||
| Length (mm) | 60.1 (48.6–70.4) | 58.6 (50.0–67.4) | <0.001 | 58.8 (49.7–69.3) | 57.5 (49.5–67.6) | <0.001 |
| Width (mm) | 28.2 (22.3–36.4) | 27.6 (21.6–35.7) | 0.01 | 28.0 (21.8–35.4) | 27.5 (21.4–36.5) | 0.04 |
| Depth (mm) | 26.5 (20.1–33.0) | 25.5 (20.2–32.2) | <0.001 | 27.8 (21.3–34.9) | 27.0 (20.9–34.0) | 0.001 |
| Volume (cm3) | 23.8 (14.0–36.6) | 21.9 (13.9–33.4) | <0.001 | 24.0 (15.3–35.6) | 22.4 (14.2–34.6) | <0.001 |
| Age 24 months | (n = 330) | (n = 318) | (n = 347) | (n = 336) | ||
| Length (mm) | 66.8 (56.1–80.3) | 65.7 (53.7–78.0) | 0.03 | 65.2 (54.8–76.6) | 64.3 (53.2–76.5) | 0.04 |
| Width (mm) | 30.8 (25.6–37.1) | 30.1 (23.5–37.8) | 0.01 | 30.7 (25.6–38.0) | 30.6 (25.2–37.1) | 0.61 |
| Depth (mm) | 30.9 (24.8–38.9) | 30.1 (24.2–38.1) | 0.002 | 32.0 (25.5–39.4) | 31.9 (25.9–39.6) | 0.79 |
| Volume (cm3) | 33.6 (22.8–51.6) | 31.8 (19.3–52.2) | 0.004 | 33.8 (22.9–53.3) | 33.1 (22.1–49.2) | 0.19 |