| Open surgery | Percutaneous nephrolithotomy | |
---|
Association between type of surgery and surgical outcome, disregarding kidney-stone size |
Failure | 77 | 61 | |
Success | 273 | 289 | |
Total | 350 | 350 | |
Percentage success | 78% | 83% | Difference = 5% | \(\phi = .06\) |
| Large stone | Small stone | |
---|
Association between kidney-stone size and surgical outcome, disregarding type of surgery |
Failure | 96 | 42 | |
Success | 247 | 315 | |
Total | 343 | 357 | |
Percentage success | 72% | 88% | Difference = 16% | \(\phi = .20\) |
| Open surgery | Percutaneous nephrolithotomy | |
---|
Association between type of surgery and kidney-stone size, disregarding surgical outcome |
Large stone | 263 | 80 | |
Small stone | 87 | 270 | |
Total | 350 | 350 | |
Percentage small stone | 25% | 77% | Difference = 52% | \(\phi = .52\) |
- Surgical outcome coded 0 = failure, 1 = success; type of surgery coded 0 = open surgery, 1 = percutaneous nepholithotomy; kidney-stone size coded 0 = large stone, 1 = small stone