Table 4.
Factors associated with mortality in multivariate analysis
| Factor | OR | 95% CI | p value |
|---|---|---|---|
| Age | 1.08 | 1.03–1.04 | < 0.001 |
| Elixhauser Comorbidity Index | 1.36 | 1.32–1.40 | < 0.001 |
| Female | 0.67 | 0.61–0.74 | < 0.001 |
| Geographic region | |||
| Northeast | REF | – | – |
| Midwest | 0.84 | 0.73–0.98 | 0.03 |
| South | – | – | NS |
| West | 0.71 | 0.61–0.82 | NS |
| Ethnicity | |||
| White | REF | – | – |
| Black | 1.50 | 1.26–1.79 | < 0.001 |
| Hispanic | – | – | NS |
| Asian | – | – | NS |
| Native American | – | – | NS |
| Type of arthroplasty | |||
| THA | 1.84 | 1.66–2.03 | < 0.001 |
| TKA | – | – | NS |
| Revision THA | 2.94 | 2.58–3.37 | < 0.001 |
| Revision TKA | – | – | NS |
| Insurance | |||
| Medicare | REF | – | – |
| Medicaid | 1.92 | 1.40–2.63 | < 0.001 |
| Private | – | – | NS |
| Self-pay | 2.07 | 1.14–3.75 | 0.016 |
| No charge | – | – | NS |
| Other | 0.70 | 0.51–0.96 | 0.03 |
| Year | 0.88 | 0.86–0.89 | < 0.001 |
| UTI | 1.47 | 1.27–1.71 | < 0.001 |
| Pneumonia | 5.23 | 4.35–6.30 | < 0.001 |
| Sepsis | 8.56 | 5.97–12.28 | < 0.001 |
| Severe sepsis | 66.28 | 57.18–76.81 | < 0.001 |
* For factors with more than two categories, the reference category is labeled REF; OR = odds ratio; CI = confidence interval; NS = not significant; UTI = urinary tract infection.