F8 and atrial fibrillation: FVIII and VWF levels showed good correlation in AF patients (Spearman r = 0.808, 95% CI: 0.691–0.884, p < 0.0001) as well as in non-AF controls (Pearson r = 0.737, 95% CI: 0.502–0.871, p < 0.0001), suggesting that they are in a complex form.