Table 1.
Descriptive simple statistics for predictive variables of interest included in the analysis for the entire study population.
| TKA Recipients (n = 305,577) | |
|---|---|
| Age of Patient in Years- Mean | 66.51 |
| Biological Sex of Patient | |
| Male | 117,406 (38.4%) |
| Female | 188,068 (61.5%) |
| Primary Payor | |
| Medicare | 174,756 (57.2%) |
| Medicaid | 13,334 (4.4%) |
| Private insurance | 106,410 (34.8%) |
| Other | 11,077 (3.6%) |
| Race of Patient | |
| White | 237,015 (77.6%) |
| African American | 23,930 (7.8%) |
| Hispanic | 17,729 (5.8% |
| Asian or Pacific Islander | 4,484 (1.5%) |
| Native American | 1,243 (0.4%) |
| Other or Unknown | 6,203 (2%) |
| Median household income national quartile for patient ZIP Code | |
| 0-25th percentile | 67,060 (21.9%) |
| 26th to 50th percentile (median) | 80,117 (26.2%) |
| 51st to 75th percentile | 81,480 (26.7%) |
| 76th to 100th percentile | 72,468 (23.7%) |
| Unknown | 4,452 (1.5%) |
| Bedsize of Hospital | |
| Small | 91,630 (30%) |
| Medium | 87,561 (28.7%) |
| Large | 126,386 (41.4%) |
| Location/Teaching Status | |
| Rural | 31,225 (10.2%) |
| Urban Nonteaching | 88,872 (29.1%) |
| Urban Teaching | 185,480 (60.7%) |
| Region of hospital | |
| Northeast | 53,637 (17.6%) |
| Midwest | 81,590 (26.7%) |
| South | 109,736 (35.9%) |
| West | 60,614 (19.8%) |
| Control/ownership of hospital | |
| Government, nonfederal | 25,371 (8.3%) |
| Private, not-for-profit | 229,407 (75.1%) |
| Private, investor-owned | 50,799 (16.6%) |
| Census Division of hospital | |
| New England | 15,200 (5%) |
| Middle Atlantic | 38,437 (12.6%) |
| East North Central | 54,530 (17.8%) |
| West North Central | 27,060 (8.9%) |
| South Atlantic | 57,054 (18.7%) |
| East South Central | 20,712 (6.8%) |
| West South Central | 31,970 (10.5%) |
| Mountain | 23,494 7.7%) |
| Pacific | 37,120 (12.1%) |
| Patient Location: NCHS Urban-Rural Code | |
| Central counties of metro areas of≥1 million population | 68,832 (22.5%) |
| Fringe counties of metro areas of≥1 million population | 77,277 (25.3%) |
| Counties in metro areas of 250,000–999,999 population | 67,499 (22.1%) |
| Counties in metro areas of 50,000–249,999 population | 32,350 (10.6%) |
| Micropolitan counties | 33,621 (11%) |
| Not metropolitan or micropolitan counties | 25,702 (8.4%) |
| Unknown | 296 (0.1%) |