F8 and deep vein thrombosis: Independent risk factors for DVT were postoperative FVIII:C levels (odds ratio [OR] = 1.01, 95% confidence interval [CI] = 1.00–1.02), age ≥60 years (OR = 6.57, 95% CI = 3.24–13.32), and operation time (OR = 2.90, 95% CI = 1.35–6.23).