Table 4. Analysis of Stone Clearance Rates by Stone Size and Location.
Statistical significance, determined using the Chi-square test (p < 0.05), is presented for stone size, location (stone-free vs. residual status), and composition (calcium oxalate, struvite, uric acid, cystine, mixed) to analyze clearance rates.
| Variable | Sub-categories | Stone-Free Status, n (%) | Residual Stones, n (%) | Chi-Square Value | p-value |
| Stone Size (cm) | 2-3 cm | 240 (80.00%) | 60 (20.00%) | 2.023 | 0.155 |
| > 3 cm | 80 (65.57%) | 42 (34.43%) | |||
| Stone Location | Upper Calyx | 90 (75.00%) | 30 (25.00%) | 0.051 | 0.82 |
| Mid Calyx | 70 (70.00%) | 30 (30.00%) | 2.26 | 0.133 | |
| Lower Calyx | 40 (50.00%) | 40 (50.00%) | 17.38 | < 0.001 | |
| Pelvis | 50 (71.42%) | 20 (28.58%) | 0.686 | 0.408 | |
| Multiple Locations | 30 (57.69%) | 22 (42.31%) | 10.16 | 0.001 | |
| Stone Composition | Calcium Oxalate | 150 (75.00%) | 50 (25.00%) | 1.56 | 0.251 |
| Struvite | 70 (80.00%) | 20 (20.00%) | 0.28 | 0.598 | |
| Uric Acid | 60 (80.00%) | 15 (20.00%) | 1.23 | 0.268 | |
| Cystine | 30 (85.00%) | 5 (15.00%) | 0.87 | 0.351 | |
| Mixed | 112 (70.00%) | 48 (30.00%) | 2.48 | 0.212 |