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Table 1 Comparison of the two groups for the demographic and baseline characteristics

From: Acute kidney injury following supine mini-PNL versus retrograde intrarenal surgery in patients with renal stones < 3 cm: a prospective comparative study

Parameters Mini-PNL group (n = 31) RIRS group (n = 29) p value
Age, mean ± SD 44.2 ± 5.4 44.8 ± 5.6 0.87
Gender, n (%)    0.63
 Male 20 (64.5) 17 (58.6)  
 Female 11 (35.5) 12 (41.4)  
Stone location n (%)    0.41
 Upper 2 (6.4) 2 (6.9)  
 Middle 8 (25.8) 12 (41.4)  
 Lower 21 (67.8) 15 (51.7)  
Stone size, (mm) mean ± SD 24.6 ± 5.4 18.2 ± 4.4 0.02
Stone density (Hounsfield Unit), mean ± SD 998 ± 128.6 880 ± 120.1 0.04
Preoperative uNGAL (ng/ml) mean ± SD 21.8 ± 9.4 24.2 ± 8.8 0.76