Table 1:
Baseline Demographics and 2nd Procedure Characteristics
| Variables | N | URS (95216) | ESWL (94523) | p-value |
|---|---|---|---|---|
| Mean age, years (SD) | 47.4 (11.1) | 48.3 (10.6) | <0.001 | |
| Region | <0.001 | |||
| Northeast | 23445 | 12347 (13.0%) | 11098 (11.7%) | |
| North Central | 48831 | 25387 (26.7%) | 23444 (24.8%) | |
| South | 88356 | 42831 (45.0%) | 45525 (48.2%) | |
| West | 25213 | 12540 (13.2%) | 12673 (13.4%) | |
| Unknown | 3894 | 2111 (2.2%) | 1783 (1.9%) | |
| Sex | 0.004 | |||
| Male | 107580 | 53702 (56.4%) | 53878 (57.0%) | |
| Female | 82159 | 41514 (43.6%) | 40645 (43.0%) | |
| Coronary Artery Disease | 6642 | 3523 (3.7%) | 3119 (3.3%) | <0.001 |
| Chronic Kidney Disease | 1519 | 857 (0.9%) | 662 (0.7%) | <0.001 |
| Diabetes | 23147 | 11521 (12.1%) | 11626 (12.3%) | 0.139 |
| Gout | 1884 | 921 (1.0%) | 963 (1.0%) | 0.258 |
| Hypertension | 43417 | 21417 (22.5%) | 22000 (23.3%) | <0.001 |
| Morbid Obesity | 7958 | 4423 (4.6%) | 3535 (3.7%) | <0.001 |
| Multiple Sclerosis | 689 | 362 (0.38%) | 327 (0.35%) | 0.215 |
| Neurogenic Bladder | 678 | 366 (0.4%) | 312 (0.3%) | 0.047 |
| Paralysis | 606 | 354 (0.4%) | 252 (0.3%) | <0.001 |
| Crohn’s Disease | 1138 | 571 (0.6%) | 567 (0.6%) | 0.104 |
| Ulcerative Colitis | 638 | 334 (0.35%) | 304 (0.32%) | 0.273 |
| Inflammatory Bowel Disease | 1708 | 857 (0.9%) | 851 (0.9%) | 0.056 |
| Subset of Observations who proceeded to 2nd Procedure | ||||
| N | URS (12038) | ESWL (17692) | p-value | |
| Median time til 2nd procedure, months (IQR) | 14.6 (7.1-27.4) | 12.5 (5.7-26.0) | ||
| Repeat procedures per | 4.4 | 6.8 | ||
| 100-person years | ||||
| 2nd Procedure URS | 11738 | 6236 (51.8%) | 5502 (31.1%) | <0.001 |
| 2nd Procedure ESWL | 17654 | 5694 (47.3%) | 11960 (67.6%) | <0.001 |
| 2nd Procedure PCNL | 856 | 325 (2.7%) | 531 (3.0%) | 0.218 |
| 2nd Procedure Non-Endo | 101 | 48 (0.4%) | 53 (0.3%) | 0.083 |