Table 1.
Characteristics of included patients.
| Parameters | Failed to insert UAS (n = 29) | Success to insert UAS (n = 231) | P value |
|---|---|---|---|
| Age (years), mean (SD) | 42.4 ± 13.4 | 47.3 ± 13.1 | 0.056 |
| Gender (males), n (%) | 23 (79.3%) | 140 (60.6%) | 0.050 |
| Height (cm), mean (SD) | 167.00 ± 8.35 | 164.59 ± 7.96 | 0.128 |
| Weight (kg), mean (SD) | 68.33 ± 13.51 | 65.29 ± 11.40 | 0.186 |
| BMI (kg/m2) | 24.31 ± 3.41 | 23.99 ± 3.14 | 0.606 |
|
| |||
| Stone side | |||
| Right | 15 | 109 | 0.645 |
| Left | 14 | 122 | |
|
| |||
| Stone location | |||
| Kidney | 6 | 70 | 0.283 |
| Ureter | 23 | 161 | |
|
| |||
| Hydronephrosis | |||
| Yes | 22 | 160 | 0.465 |
| No | 7 | 71 | |
|
| |||
| Length of history | |||
| 0–14 days | 19 | 118 | 0.083 |
| 15–31 days | 6 | 34 | |
| >31 days | 4 | 79 | |
|
| |||
| CT based parameters | |||
| Long diameter of ureteral calculi (mm), mean (SD) | 10.79 ± 5.56 | 10.95 ± 4.83 | 0.873 |
| Short diameter of ureteral calculi (mm), mean (SD) | 7.62 ± 3.45 | 7.56 ± 2.22 | 0.926 |
| Diameter of the widest part of the kidney parenchyma (mm), mean (SD) | 23.24 ± 4.71 | 21.95 ± 5.09 | 0.195 |
| Diameter of the narrowest part of the renal parenchyma (mm), mean (SD) | 12.62 ± 3.28 | 11.95 ± 3.66 | 0.346 |
| Diameter of the abdominal aorta (mm), mean (SD) | 15.4 ± 2.2 | 15.7 ± 2.2 | 0.559 |
| Diameter of the ipsilateral common iliac artery (mm), mean (SD) | 10.5 ± 1.8 | 11.2 ± 2.2 | 0.071 |
| Diameter of the contralateral common iliac artery (mm), mean (SD) | 10.6 ± 3.2 | 11.5 ± 2.8 | 0.122 |
UAS: ureteral access sheath.