Table 4 Cox proportional hazard models of thirty-day 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 | 437 | 1 (reference) | Â |
Female | 516 | 0.96 (0.84–1.09) | 0.5166 |
Age (years) | |||
20–29 | 3 | 1 (reference) |  |
30–39 | 6 | 0.761 (0.20 -2.92) | 0.762 |
40–49 | 17 | 1.38 (0.44–4.36) | 0.5841 |
50–59 | 66 | 2.84 (0.96–8.35) | 0.0585 |
60–69 | 127 | 4.39 (1.51–12.74) | 0.0065 |
70–79 | 311 | 7.82 (2.72–22.50) | 0.0001 |
80–89 | 355 | 16.08 (5.59–46.23) |  < 0.0001 |
90–99 | 67 | 25.45 (8.61–75.18) |  < 0.0001 |
 ≥ 100 | 1 | 20.23 (2.97–137.67) | 0.0021 |
Charlson Comorbidity Index Score | |||
0 | 220 | 1 (reference) | Â |
1 | 209 | 1.26 (1.03–1.54) | 0.0264 |
2 | 149 | 1.58 (1.27–1.97) |  < 0.0001 |
 ≥ 3 | 375 | 3.63 (3.05–4.33) |  < 0.0001 |
Surgery | |||
No | 822 | 1 (reference) | Â |
Yes | 131 | 1.02 (0.83–1.25) | 0.8603 |
Antibiotics | |||
No | 243 | 1 (reference) | Â |
Yes | 710 | 1.08 (0.93–1.25) | 0.318 |
