Table 1 Demographic data in the stone-free and remnant groups.
From: The impact of Hounsfield unit-related variables on percutaneous nephrolithotomy outcomes
Stone-free (N = 149) | Remnant (N = 39) | p | |
|---|---|---|---|
Male | 103 (69.1%) | 23 (59.0%) | 0.313 |
Age (years) | 55.0 ± 12.7 | 55.3 ± 14.4 | 0.892 |
BMI | 24.8 ± 3.5 | 24.0 ± 3.4 | 0.241 |
ASA class | 0.925 | ||
2 | 92 (61.7%) | 25 (64.1%) | |
3 | 10 (6.7%) | 2 (5.1%) | |
Laterality (Rt) | 87 (58.4%) | 17 (43.6%) | 0.140 |
Hydronephrosis | 46 (56.1%) | 14 (46.7%) | 0.501 |
Pre OP SWL | 30 (20.1%) | 6 (15.4%) | 0.658 |
Pre OP pyuria | 65 (43.6%) | 20 (51.3%) | 0.500 |
Upper calyx stone | 10 (6.7%) | 5 (12.8%) | 0.357 |
Mid-calyx stone | 8 (5.4%) | 2 (5.1%) | 1.000 |
Lower calyx stone | 38 (25.5%) | 19 (48.7%) | 0.009 |
Pelvic or UPJ stone | 93 (62.4%) | 13 (33.3%) | 0.002 |
SSD mean (mm) | 87.1 ± 15.6 | 85.6 ± 15.1 | 0.608 |
Stone size (mm) | 16.8 ± 4.6 | 17.4 ± 5.2 | 0.515 |
Stone cross-sectional area (mm2) | 94.5 ± 46.1 | 128.3 ± 98.5 | 0.043 |
Stone burden (mm2) | 163.5 ± 113.7 | 177.2 ± 110.8 | 0.503 |
Radio opacity | 120 (80.5%) | 30 (76.9%) | 0.782 |
Hounsfield unit (HU) | 769.2 ± 304.9 | 750.2 ± 349.6 | 0.737 |
Stone heterogeneity index (SD) | 213.7 ± 110.7 | 203.0 ± 126.7 | 0.603 |
HU density (HU/mm) | 48.0 ± 20.1 | 43.5 ± 19.2 | 0.216 |
HU density (HU/mm2) | 10.1 ± 5.6 | 7.3 ± 3.4 | 0.001 |
Variation coefficient (%) | 28.3 ± 12.9 | 27.6 ± 12.3 | 0.765 |
