Table 3.
Risk for surgery in children with antenatal hydronephrosis by baseline anterior posterior diameter of the renal pelvis, Society for Fetal Urology grading system and a combined grading system
| Grading Systems (N=348) | Children Who Underwent Surgery (n=96) | Adjusted Hazard Ratioa | 95% CI |
|---|---|---|---|
| APD | |||
| <6 mm | 2 (2.1) | ref | — |
| ≥6–9 mm | 7 (7.3) | 3.7 | 0.76 to 17.8 |
| ≥9–15 mm | 22 (22.9) | 8.5 | 1.99 to 36.1 |
| >15 mm | 65 (67.7) | 41.3 | 10.1 to 168.8 |
| SFU grade | |||
| 1 | — | — | — |
| 2 | 7 (7.3) | ref | — |
| 3 | 23 (23.9) | 8.9 | 3.84 to 20.9 |
| 4 | 66 (68.8) | 23.9 | 10.9 to 52.38 |
| Combined grading system | |||
| APD<6 mm, no/few dilated calyces (n=71) | 2 (2.1) | ref | |
| APD<6 mm, with diffuse caliectasis (n=4) | — | — | — |
| APD≥6–9 mm, no/few dilated calyces (n=60) | 1 (1.1) | 0.59 | 0.05 to 6.53 |
| APD≥6–9 mm, with diffuse caliectasis (n=12) | 6 (6.2) | 19.5 | 3.94 to 96.9 |
| APD≥9–15 mm, no/few dilated calyces (n=60) | 3 (3.1) | 1.75 | 0.29 to 10.5 |
| APD>9–15 mm, with diffuse caliectasis (n=44) | 19 (19.8) | 18.7 | 4.36 to 80.4 |
| APD>15 mm, no/few dilated calyces (n=7) | 1 (1.1) | 4.73 | 0.42 to 52.2 |
| APD>15 mm, with diffuse caliectasis (n=90) | 64 (66.6) | 44.7 | 10.9 to 183.1 |
Values are n (%) or as otherwise indicated. SFU 1 excluded from analysis because no events occurred in this group. APD, anteroposterior diameter of the renal pelvis; SFU, Society for Fetal Urology; ref, reference; no/few dilated calyces, absence of dilation of minor calyces only; diffuse caliectasis, presence of dilation of major and minor calyces; 95% CI, 95% confidence interval.
a
Hazard ratio adjusted for clinic where patient had been first seen: urology or nephrology.