Table 3. Cox proportional regression analysis showing factors affecting loss primary patency.
| Variables affecting primary patency | B | Standard error | p -Value | Hazard ratio | 95% CI for hazard ratio | |
|---|---|---|---|---|---|---|
| Lower | Upper | |||||
| Hypertension | 1.311 | 0.787 | 0.096 | 3.709 | 0.793 | 17.351 |
| Coronary artery disease | −0.730 | 0.666 | 0.274 | 0.482 | 0.131 | 1.780 |
| Previous stroke | −1.242 | 1.106 | 0.261 | 0.289 | 0.033 | 2.524 |
| Age | −0.069 | 0.074 | 0.351 | 0.933 | 0.806 | 1.079 |
| Diabetes mellitus | 2.085 | 1.415 | 0.141 | 8.041 | 0.503 | 128.664 |
| No smoking versus smoking | −3.363 | 1.305 | 0.010 | 0.035 | 0.003 | 0.448 |
| ABPI <0.5 | 6.318 | 10.320 | 0.540 | 554.519 | 0.000 | – |
| Rest pain | 3.015 | 1.643 | 0.067 | 20.380 | 0.813 | 510.674 |
| Ulcer | 0.085 | 1.362 | 0.950 | 1.089 | 0.075 | 15.717 |
| GLASS GRADE (2 vs. ¾) | −0.761 | 0.771 | 0.324 | 0.467 | 0.103 | 2.120 |
| TASC (C vs. D) | 0.527 | 1.1 | 0.53 | 1.5 | 0.200 | 13.988 |
| Adductor canal involvement | −2.226 | 1.850 | 0.229 | 0.108 | 0.003 | 4.058 |
| Length of occlusion (<20 vs. >20 cm) | 0.081 | 0.099 | 0.411 | 1.085 | 0.894 | 1.316 |
| Modified SVS runoff score (<10 vs. > 10) | −1.139 | 0.800 | 0.154 | 0.320 | 0.067 | 1.535 |
| 1 stent versus 2 stents | 0.16 | 0.25 | 0.80 | 1.17 | 0.34 | 4.08 |
| Calcium score (1–3 vs. 4) | −2.282 | 0.779 | 0.003 | 0.102 | 0.022 | 0.470 |
| Balloon diameter (5 vs. 6 mm) | 1.795 | 1.295 | 0.166 | 6.017 | 0.476 | 76.086 |
Abbreviations: ABPI, ankle brachial pressure index; CI, confidence interval; SVS, Society of Vascular Surgery; TASC C/D, Trans-Atlantic Inter-Society Consensus II C/D.