Table 3.
Baseline Cohort Statistics.
| Variable | All Patients (n = 89,986) |
|---|---|
|
| |
| Demographics | |
| Age (years) | Median (IQR) 67 (59–74) |
| Male | Number (%) 39,780 (44.21) |
| Race | |
| White | 75,099 (83.46) |
| Black | 4979 (5.53) |
| Asian/Pacific Islander | 3148 (3.50) |
| Native American | 233 (0.26) |
| Other | 5591 (6.21) |
| Unknown | 936 (1.04) |
| Ethnicity | |
| Non-Hispanic | 80,724 (89.71) |
| Hispanic | 8082 (8.98) |
| Unknown | 1180 (1.31) |
| Insurance | |
| Medicare | 48,803 (54.23) |
| Private | 33,196 (36.89) |
| Medi-Cal | 5530 (6.15) |
| Workers’ compensation | 1049 (1.17) |
| Other | 1408 (1.56) |
| Medical comorbidities | |
| Diabetes mellitus | 11,449 (12.72) |
| Metastatic cancer or acute leukemia | 192 (0.21) |
| Other major cancer | 1284 (1.43) |
| Respiratory/heart/digestive/urinary/other neoplasms | 654 (0.73) |
| Protein-calorie malnutrition | 472 (0.52) |
| Morbid obesity | 5526 (6.14) |
| Rheumatoid arthritis or inflammatory connective tissue disease | 3635 (4.04) |
| Osteoarthritis | 4751 (5.28) |
| Osteoporosis or other bone/cartilage disorders | 8075 (8.97) |
| Dementia | 803 (0.89) |
| Major psychiatric disorder | 3691 (4.10) |
| Hemiplegia, paraplegia, paralysis, or functional disability | 161 (0.18) |
| Chronic atherosclerosis/angina | 7380 (8.20) |
| COPD | 4856 (5.40) |
| Renal failure | 6109 (6.79) |
| Decubitus ulcer | 68 (0.08) |
| Vertebral fracture | 30 (0.03) |
| Skeletal disorders | 1878 (2.09) |
| Post-traumatic osteoarthritis | 56 (0.06) |
| Hospital volumea | Median (IQR) 1493 (990–2393) |
IQR, interquartile range; COPD, chronic obstructive pulmonary disease.
a
Cases of total hip and knee arthroplasties performed between 2015 and 2017.