Table 2 Comorbidity of patients in the in- and outpatient TKA cohorts, before and after matching
Variable | Pre-Match | Post-Match | ||||
|---|---|---|---|---|---|---|
Outpatient | Inpatient | SMD | Outpatient | Inpatient | SMD | |
Elixhauser Index: mean (SD) | 1.94 (1.46) | 2.17 (1.53) | 0.1570 | 1.94 (1.44) | 1.96 (1.45) | 0.0180 |
Elixhauser Score Category | 0.1490 | 0.0000 | ||||
0 | 1,488 (15.9%) | 4,701 (12.0%) | 1,388 (15.3%) | 1,388 (15.3%) | ||
1–2 | 4,989 (53.3%) | 20,436 (52.0%) | 4,902 (54.1%) | 4,902 (54.1%) | ||
3–4 | 2,382 (25.4%) | 11,240 (28.6%) | 2,305 (25.4%) | 2,305 (25.4%) | ||
5 or more | 506 (5.4%) | 2,960 (7.5%) | 465 (5.1%) | 465 (5.1%) | ||
Individual Comorbidities | ||||||
Hypertension | 6,057 (64.7%) | 27,169 (69.1%) | 0.0930 | 5,926 (65.4%) | 5,953 (65.7%) | 0.0060 |
Diabetes (all types) | 1,795 (19.2%) | 8,944 (22.7%) | 0.0880 | 1,733 (19.1%) | 1,868 (20.6%) | 0.0370 |
Obesity | 2,741 (29.3%) | 12,154 (30.9%) | 0.0360 | 2,637 (29.1%) | 2,439 (26.9%) | 0.0490 |
Hypothyroidism | 1,474 (15.7%) | 6,743 (17.1%) | 0.0380 | 1,429 (15.8%) | 1,431 (15.8%) | 0.0010 |
Chronic Pulmonary Disease | 1,324 (14.1%) | 6,267 (15.9%) | 0.0500 | 1,264 (14.0%) | 1,289 (14.2%) | 0.0080 |
Depression | 1,231 (13.1%) | 5,998 (15.2%) | 0.0600 | 1,177 (13.0%) | 1,242 (13.7%) | 0.0210 |
Cardiac Arrhythmia | 838 (8.9%) | 4,093 (10.4%) | 0.0490 | 823 (9.1%) | 825 (9.1%) | 0.0010 |
Renal failure | 621 (6.6%) | 2,994 (7.6%) | 0.0380 | 579 (6.4%) | 585 (6.5%) | 0.0030 |
Rheumatoid Arthritis and Collagen Diseases | 377 (4.0%) | 1,847 (4.7%) | 0.0330 | 366 (4.0%) | 405 (4.5%) | 0.0210 |
Congestive Heart Failure | 327 (3.5%) | 1,537 (3.9%) | 0.0220 | 318 (3.5%) | 272 (3.0%) | 0.0290 |
Valvular Disease | 230 (2.5%) | 1,425 (3.6%) | 0.0680 | 224 (2.5%) | 297 (3.3%) | 0.0480 |
Peripheral Vascular Disorders | 205 (2.2%) | 1,038 (2.6%) | 0.0290 | 200 (2.2%) | 190 (2.1%) | 0.0080 |
Fluid and electrolyte disorders | 197 (2.1%) | 1,127 (2.9%) | 0.0490 | 188 (2.1%) | 218 (2.4%) | 0.0220 |
Other Neurological Disorders | 160 (1.7%) | 832 (2.1%) | 0.0300 | 149 (1.6%) | 174 (1.9%) | 0.0210 |
Liver disease | 126 (1.3%) | 534 (1.4%) | 0.0010 | 119 (1.3%) | 113 (1.2%) | 0.0060 |
Coagulopathy | 100 (1.1%) | 665 (1.7%) | 0.0530 | 96 (1.1%) | 119 (1.3%) | 0.0230 |
Deficiency Anemia | 91 (1.0%) | 538 (1.4%) | 0.0370 | 84 (0.9%) | 103 (1.1%) | 0.0210 |
Pulmonary Circulatory Disorders | 52 (0.6%) | 298 (0.8%) | 0.0250 | 51 (0.6%) | 67 (0.7%) | 0.0220 |
Alcohol Abuse | 57 (0.6%) | 317 (0.8%) | 0.0240 | 54 (0.6%) | 49 (0.5%) | 0.0070 |
Drug Abuse | 56 (0.6%) | 468 (1.2%) | 0.0630 | 50 (0.6%) | 75 (0.8%) | 0.0330 |
Psychoses | 10 (0.1%) | 71 (0.2%) | 0.0190 | 8 (0.1%) | 17 (0.2%) | 0.0270 |