Table 3 Cox proportional hazard models of in-hospital mortality by variables.
From: Mortality of septic knee arthritis in Korea: risk factors analysis of a large national database
Variables | N | Univariable analysis | |
|---|---|---|---|
Hazard ratio (95% CI) | P value | ||
Gender | |||
Male | 469 | 1 (reference) | Â |
Female | 729 | 1.38 (1.25–1.52) |  < 0.0001 |
Age (years) | |||
20–29 | 6 | 1 (reference) |  |
30–39 | 5 | 0.42 (0.19–0.90) | 0.0267 |
40–49 | 17 | 0.94 (0.52–1.71) | 0.8382 |
50–59 | 63 | 1.35 (0.78–2.35) | 0.2899 |
60–69 | 147 | 2.27 (1.33–3.89) | 0.0028 |
70–79 | 379 | 3.75 (2.21–6.38) |  < 0.0001 |
80–89 | 472 | 8.63 (5.08–14.65) |  < 0.0001 |
90–99 | 105 | 15.16 (8.74–26.29) |  < 0.0001 |
 ≥ 100 | 4 | 21.29 (8.18–55.41) |  < 0.0001 |
Charlson Comorbidity Index Score | |||
0 | 276 | 1 (reference) | Â |
1 | 264 | 1.12 (0.98–1.27) | 0.0878 |
2 | 196 | 1.29 (1.11–1.49) | 0.0007 |
 ≥ 3 | 462 | 2.35 (2.09–2.65) |  < 0.0001 |
Surgery | |||
No | 985 | 1 (reference) | Â |
Yes | 213 | 2.06 (1.85–2.29) |  < 0.0001 |
Antibiotics | |||
No | 276 | 1 (reference) | Â |
Yes | 922 | 0.96 (0.87–1.07) | 0.4742 |
