NPPB and atrial fibrillation: Among people with AF, NT-proBNP sensitivity and specificity at a 125 pg/mL threshold was 98.8% (95% CI [98.5%, 99.1]) and 13.2% (95% CI [12.6%, 13.7]) and at 400 pg/mL 93.2% (95% CI [92.4, 93.9]) and 35.5% (95% CI [34.7, 36.3]).