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Multivariate Cox proportional hazards model used to investigate the factor to confounding the primary patency rates
| Hazard ratio | 95% CI | P value | |
|---|---|---|---|
| Cilostazol vs ticlopidine | 5.4 | 1.1, 27.1 | 0.042 |
| Diabetes melitus | 3.3 | 0.8, 12.5 | 0.086 |
| Cummulative length of stents | 1.1 | 0.9, 1.1 | 0.250 |
| Poor runoff | 7.5 | 1.8, 29.2 | 0.004 |
