Table 2.
Hazard ratio of in-hospital mortality relative to diabetes, age, sex, and treatment modality in patients with renal or perinephric abscess (n = 2,192).
| Variables | No. of patients admitted | In-hospital mortality | Relative risk estimates | ||||||
| N | % | HRa) | 95% CIa) | p-value | AHRa,b) | 95% CIb) | p-value | ||
| Diabetes | |||||||||
| No | 477 | 16 | 3.4 | 1.00 | 1.00 | ||||
| Yes | 1,715 | 40 | 2.3 | 0.69 | 0.38-1.24 | 0.213 | 0.91 | 0.49-1.69 | 0.759 |
| Sex | |||||||||
| Male | 504 | 21 | 4.2 | 2.05*) | 1.18-3.56 | 0.010 | 2.03*) | 1.15-3.59 | 0.015 |
| Female | 1,688 | 35 | 2.1 | 1.00 | 1.00 | ||||
| Age | |||||||||
| <45 | 242 | 3 | 1.2 | 1.00 | 1.00 | ||||
| 45-54 | 450 | 5 | 1.1 | 0.90 | 0.21-3.78 | 0.881 | 0.80 | 0.18-3.65 | 0.775 |
| 55-64 | 681 | 15 | 2.2 | 1.79 | 0.52-6.25 | 0.359 | 2.31 | 0.65-8.16 | 0.195 |
| >64 | 819 | 33 | 4.0 | 3.34*) | 1.02-11.00 | 0.046 | 3.86*) | 1.15-12.98 | 0.029 |
| Treatment modality | |||||||||
| Antimicrobials only | 1,640 | 39 | 2.4 | 1.00 | 1.00 | ||||
| Percutaneous drainage | 320 | 12 | 3.8 | 1.60 | 0.83-3.09 | 0.162 | 1.30 | 0.63-2.66 | 0.478 |
| Surgical drainage | 137 | 4 | 2.9 | 1.24 | 0.44-3.51 | 0.692 | 1.51 | 0.52-4.39 | 0.448 |
| Nephrectomy | 95 | 1 | 1.1 | 0.44 | 0.06-3.21 | 0.416 | 0.45 | 0.06-3.40 | 0.442 |
| Total | 2192 | 56 | 2.6 | ||||||
a
HR = hazard ratio; CI = confidence interval; AHR = adjusted hazard ratio.
b
Estimated from Cox's multivariate proportional hazard model, with diabetes, age, sex, treatment modality, geographic area, and urbanization level simultaneously included in the model.
*
p<0.05.