Table 3 Association between risk factors and device failure identified by multivariable Cox Regression (N = 664)
Variable | All cause failure | Suspected CABSI | Occlusion |
|---|---|---|---|
| Â | Hazard ratio (95% CI) | Sub hazard ratio (95% CI) | Sub hazard ratio (95% CI) |
Ultrasound  Yes | 0.48 (0.31 to 0.73) |  | 0.12 (0.03 to 0.49) |
Age | Â | Â | Â |
 16–59 | Reference | ^ | ^ |
 60–74 | 0.63 (0.44 to 0.89) |  |  |
 75+  | 0.36 (0.20 to 0.64) |  |  |
Site check | Â | Â | Â |
 Not normal | ^ | 2.71 (1.48, 4.99) |  |
Diabetes  Yes | ^ | ^ | 2.44 (1.43 to 4.18) |
Gender  Female | ^ | ^ | 0.18 (0.04 to 0.73) |