Table 1.
Demographic and pre-operative data
| UAS size | 9.5/11.5fr | 12/14fr | Total | p-value |
|---|---|---|---|---|
| N | 86 | 79 | 165 | |
| Gender (%male) | 69.7 | 54.4 | 62.4 | 0.121 |
| Median age (range) | 53.5 (18-81) | 58 (24-83) | 57 (18-83) | 0.042 |
| BMI (median, IQR) | 28.4 (24.5-32.3) | 28.6 (25-31.2) | 28.4 (24.7-31.8) | 0.821 |
| Systemic conditions | ||||
| Diabetes mellitus (%) | 25.6 | 39.2 | 32.1 | 0.061 |
| Hypertension (%) | 41.9 | 48.1 | 44.8 | 0.424 |
| Chronic renal failure (%) | 7.0 | 3.8 | 5.5 | 0.299 |
| Peripheral vascular disease (%) | 1.2 | 0 | 0.6 | 0.339 |
| Ischemic heart disease (%) | 7.0 | 3.8 | 5.5 | 0.372 |
| Hyperlipidemia (%) | 30.2 | 40.5 | 35.2 | 0.169 |
| Average number of conditions | 1.4 | 1.52 | 1.45 | 0.534 |
| Stone disease | ||||
| Number of stones (average, range) | 1.5 (1-5) | 1.6 (1-7) | 1.6 (1-7) | 0.506 |
| Largest stone diameter (mm) (median, IQR) | 13 (9-16) | 15 (11-20) | 15 (10-19) | 0.019 |
| Total stone burden (cm3) (median, IQR) | 2.3 (1.0-5.4) | 3.4 (1.6-8.0) | 3.4 (1-7.4) | 0.031 |
| Lower pole stone (%) | 39 | 38 | 38.7 | 0.907 |
| Pre-operative hydronephrosis | 0.461 | |||
| No (%) | 57.0 | 64.9 | 60.7 | |
| Mild (%) | 25.6 | 19.5 | 22.7 | |
| Intermediate (%) | 15.1 | 13 | 14.1 | |
| Severe (%) | 2.3 | 2.6 | 2.4 | |
p-value is for univariate analysis. Statistical significance was defined as p ≤ 0.05 and is shown in bold