NT-proBNP at baseline P-value NT-proBNP after 24 hours P-value NT-proBNP after 72 hours P-value Incident AF 0.657 (SE 0.034) <0.001 N/A   N/A   AF on admission 0.591 (SE 0.049) 0.058 N/A   N/A   AF 24-72 hours after admission 0.747 (SE 0.060) 0.002 0.829 (SE 0.045) <0.001 N/A   AF >72 hours after admission 0.705 (SE 0.053) 0.003 0.736 (SE 0.061) 0.001 0.891 (SE 0.057) <0.001

P-values between AUCs:         AF >24 hours after admission NT-proBNP at baseline vs. NT-proBNP after 24 hours: z-statistic 1.177, P=0.239 AF >72 hours after admission NT-proBNP at baseline vs. NT-proBNP after 24 hours: z-statistic 3.111, P=0.002 AF >72 hours after admission NT-proBNP at baseline vs. NT-proBNP after 72 hours: z-statistic 2.779, P=0.006 AF >72 hours after admission NT-proBNP after 24 hours vs. NT-proBNP after 72 hours: z-statistic 0.495, P=0.621

Table 3: Receiver-operator characteristic of NT-proBNP in the prediction of atrial fibrillation.