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Comparison of risk factors in each cohort, including coumadin, pulmonary embolism, deep vein thrombosis, hypertension, atrial fibrillation, diabetes mellitus, hypocholesteremia.
| Bipolar HA No = 0 Yes = 1 | Cannulated screw No = 0 Yes = 1 | P-value | |
| Coumadin | 0.07 | 0.05 | .61 |
| Pulmonary embolism | 0 | 0 | NA |
| Deep vein thrombosis | 0 | 0 | NA |
| Hypertension | 0.59 | 0.50 | .17 |
| Atrial fibrillation | 0.12 | 0.11 | .76 |
| Diabetes mellitus | 0.27 | 0.21 | .30 |
| Hypocholesteremia | 0.24 | 0.23 | .86 |
