Table IV.
Matched cohort patient factors and demographic information
| 3:1 Matched Cohort | |||
|---|---|---|---|
| Variables | Controls | SLE | P-value |
| Number of surgeries | 6,852 | 2,284 | |
| Age, years, mean(sd) | 65.41(11.09) | 58.85(12.94) | <0.0001 |
| Sex, %(N) | <0.0001 | ||
| Male | 39.78(2696) | 9.64(220) | |
| Female | 60.22(4082) | 90.36(2,063) | |
| Race, %(N) | <0.0001 | ||
| White | 82.96(667) | 68.70(1,385) | |
| Black | 8.71(70) | 21.83(440) | |
| Hispanic | 4.48(36) | 5.26(106) | |
| Other | 3.86(31) | 4.22(85) | |
| Corticosteroid, %(N) | 0.73(50) | 12.00(274) | <0.0001 |
| Osteonecrosis of the hip, %(N) | 2.61(179) | 15.81(361) | <0.0001 |
| Spasm of muscle, %(N) | 0.20(14) | 0.44(10) | 0.059 |
| Gait abnormality, %(N) | 0.35(24) | 0.66(15) | 0.0517 |
| Contracture of joint, pelvic region and thigh, %(N) | 0.15(10) | 0.09(2) | 0.7417 |
| Hospital region, %(N) | <0.0001 | ||
| South | 20.94(1435) | 44.22(1,010) | |
| Northeast | 3.58(245) | 15.89(363) | |
| Midwest | 62.27(4267) | 22.42(512) | |
| West | 13.21(905) | 17.47(399) | |
| Vitamin D deficiency, %(N) | 1.50(103) | 1.66(38) | 0.5899 |
| Surgery Type, %(N) | <0.0001 | ||
| THA | 30.75(2107) | 36.56(835) | |
| TKA | 69.25(4745) | 63.44(1,449) | |
| Charlson comorbidity index, mean(sd) | 0.62(0.95) | 1.61(0.91) | <0.0001 |