NPPB and atrial fibrillation: However, multivariable regression analysis highlighted miR−21 (HR 0.16 (95%CI 0.04–0.7), p = 0.009) and NT-proBNP (HR 1.002 (95%CI 1.001–1.004), p = 0.006) as independent predictors with the presence of AF in the complete cohort (as provided in Table 4).