Table 1.
Overview of study population and summary statistics of candidate PF variables, by surgical treatment.
| Variable | Laparoscopic resection of colorectal carcinoma (CRC) | Transurethral resection of urinary bladder carcinoma (UBC) | Acute percutaneous coronary intervention (aPCI) | Total knee arthroplasty for osteoarthritis (TKA) | Total study population |
|---|---|---|---|---|---|
| Total number of patients | 10,254 | 17,385 | 25,818 | 39,214 | 92,671 |
| Number of hospitals | 63 | 65 | 24 | 64 | 66 |
| Number of patients in 2016 (% of total) | 5566 (54.3%) | 9911 (57.0%) | 13,204 (51.1%) | 20,765 (53.0%) | 49,446 (53.4%) |
| Number of patients in 2017 (% of total) | 4688 (45.7%) | 7474 (43.0%) | 12,614 (48.9%) | 18,449 (47.0%) | 43,225 (46.6%) |
| Mean age (SD) | 67.4 (12.7) | 70.8 (11.0) | 65.1 (12.0) | 69.0 (9.2) | 68.1 (11.0) |
| Female sex (%) | 5028 (49.0%) | 4114 (23.7%) | 7229 (28.0%) | 25,043 (63.9%) | 41,414 (44.7%) |
| Elixhauser index 0 (%) | 1094 (10.7%) | 731 (4.2%) | 19,990 (77.4%) | 29,092 (74.2%) | 50,907 (54.9%) |
| Elixhauser index 1 (%) | 6219 (60.6%) | 1,0879 (62.6%) | 3892 (15.1%) | 7594 (19.4%) | 28,584 (30.8%) |
| Elixhauser index 2 (%) | 1780 (17.4%) | 4015 (23.1%) | 1224 (4.7%) | 1878 (4.8%) | 8897 (9.6%) |
| Elixhauser index 3 (%) | 673 (6.6%) | 1254 (7.2%) | 459 (1.8%) | 469 (1.2%) | 2855 (3.1%) |
| Elixhauser index 4 (%) | 317 (3.1%) | 374 (2.2%) | 118 (0.5%) | 132 (0.3%) | 941 (1.0%) |
| Elixhauser index 5 (%) | 109 (1.1%) | 80 (0.5%) | 86 (0.3%) | 39 (0.1%) | 314 (0.3%) |
| Elixhauser index > 5 (%) | 62 (0.6%) | 52 (0.3%) | 49 (0.2%) | 10 (0.0%) | 173 (0.2%) |
| Mean Elixhauser comorbidity score (SD) | 4.9 (3.8) | 5.5 (3.8) | 1.2 (3.1) | 1.1 (2.8) | 2.3 (3.7) |
| Socio-Economic Status class 1 (%) reference | 3306 (32.2%) | 5298 (30.5%) | 6739 (26.1%) | 11,559 (29.5%) | 26,902 (29.0%) |
| Socio-Economic Status class 2 (%) | 3767 (36.7%) | 6214 (35.7%) | 9125 (35.3%) | 14,820 (37.8%) | 33,926 (36.6%) |
| Socio-Economic Status class 3 (%) | 3181 (31.0%) | 5873 (33.8%) | 9954 (38.6%) | 12,835 (32.7%) | 31,843 (34.4%) |
| 0 hospitalizations in years prior to treatment (%) | 9597 (93.6%) | 16,358 (94.1%) | 25,747 (99.7%) | 38,881 (99.2%) | 90,583 (97.7%) |
| 1 hospitalization in years prior to treatment (%) | 554 (5.4%) | 833 (4.8%) | 67 (0.3%) | 314 (0.8%) | 1768 (1.9%) |
| 2 hospitalizations in years prior to treatment (%) | 81 (0.8%) | 137 (0.8%) | 3 (0.0%) | 16 (0.0%) | 237 (0.3%) |
| > 2 hospitalizations in years prior to treatment (%) | 22 (0.2%) | 41 (0.3%) | 1 (0.0%) | 3 (0.0%) | 83 (0.1%) |