Table 1.
Comparison of demographic data of patients
| Parameter | Group 1 (n=91) | Group 2 (n=97) | P |
|---|---|---|---|
| Age (year, SD) | 51.79±12.99 | 51.26±12.94 | 0.8605 |
| Gender (male) | 63 | 68 | 0.8965 |
| BMI (kg/m2, SD) | 23.97±3.02 | 24.46±2.96 | 0.4866 |
| kidney | 49 | 54 | 0.8316 |
| Stone position ureter | 20 | 18 | 0.6769 |
| kidney & ureter | 22 | 25 | 0.8004 |
| Stone burden (cm, SD) | 4.25±1.26 | 3.98±1.40 | 0.2821 |
| Diabetes mellitus | 5 | 7 | 0.6293 |
| hypertension | 10 | 11 | 0.9391 |
| Pre-operative serum creatinine level (mmol/L, SD) | 76.42±16.72 | 80.67±14.74 | 0.2479 |
| Post-operative serum creatinine level (mmol/L, SD) | 84.64±17.17 | 81.53±14.61 | 0.4001 |
| Operation time (minute, SD) | 42.16±15.58 | 48.82±15.92 | 0.0734 |
| Pre-operative hemoglobin (g/L, SD) | 130.05±18.93 | 135.15±12.92 | 0.178 |
| Post-operative hemoglobin (g/L, SD) | 113.84±19.94 | 124.45±13.58 | 0.0101* |
| Delta hemoglobin (g/L, SD) | 16.24±10.98 | 10.71±5.57 | 0.009* |
| Post-operative blood loss (g, SD) | 25.76±23.99 | 14.25±6.87 | 0.0072* |
| Stone-free | 75 | 74 | 0.3003 |
| Post-operative hospital stay (day, SD) | 5.24±2.31 | 5.13±1.17 | 0.8031 |
| Super-selective renal arterial embolization | 4 | 1 | 0.1519 |
| Blood transfusion | 5 | 1 | 0.0819 |
SD: Standard deviation; BMI: Body mass index; delta hemoglobin=Pre-operative hemoglobin-post-operative hemoglobin;
*
Statistical significant P value.