NPPB and atrial fibrillation: However, in the patient group with atrial fibrillation (Afib group), the patients were older (77.6 ± 7.6 vs. 75.5 ± 9.8 years, p = 0.024) and had higher levels of baseline NT-pro-BNP (6517.5 ± 7308.0 vs. 4153.8 ± 4682.5 pg/mL; p = 0.010).