Results of multivariable regression including race and income. Adjusted for race, age, sex, hospital type, surgical indication, length of hospital stay, income, and modified comorbidity index.
| RA vs Controls OR (95% CI) | p | SLE vs Controls OR (95% CI) | p | |
|---|---|---|---|---|
| Overall | ||||
| All hip | 0.949 (0.626–1.441) | 0.81 | 3.956 (1.947–8.036) | < 0.001 |
| All knee | 0.637 (0.443–0.916) | 0.02 | 1.211 (0.196–7.490) | 0.84 |
| All elective | 0.575 (0.405–0.815) | 0.002 | 1.605 (0.595–4.331) | 0.35 |
| All nonelective | 1.346 (0.853–2.124) | 0.2 | 5.483 (2.333–12.887) | < 0.001 |
| Nonfracture subgroup | ||||
| All hip | 0.860 (0.542–1.366) | 0.52 | 3.499 (1.607–7.618) | 0.002 |
| All knee | 0.755 (0.525–1.087) | 0.13 | 1.377 (0.220–8.601) | 0.73 |
| All elective | 0.637 (0.448–0.905) | 0.01 | 1.762 (0.657–4.727) | 0.26 |
| All nonelective | 1.424 (0.852–2.379) | 0.18 | 4.935 (1.784–13.654) | 0.002 |
| Overall prior to 2002 | ||||
| All hip | 0.978 (0.589–1.623) | 0.93 | 4.284 (1.794–10.229) | 0.001 |
| All knee | 0.775 (0.517–1.163) | 0.22 | 1.155 (0.073–18.372) | 0.92 |
| All elective | 0.658 (0.434–0.997) | 0.05 | 1.375 (0.212–8.937) | 0.74 |
| All nonelective | 1.344 (0.804–2.246) | 0.26 | 5.539 (2.082–14.739) | < 0.001 |
| Overall, on or after 2002 | ||||
| All hip | 0.876 (0.430–1.785) | 0.72 | 3.200 (0.840–12.190) | 0.09 |
| All knee | 0.350 (0.155–0.789) | 0.01 | 1.462 (0.203–10.515) | 0.71 |
| All elective | 0.452 (0.240–0.851) | 0.01 | 1.690 (0.492–5.813) | 0.40 |
| All nonelective | 1.021 (0.377–2.761) | 0.97 | 5.191 (1.175–22.930) | 0.03 |