FOXK2 and atrial fibrillation: The mean FA ratio (%) was 67.5 ± 7.2 vs. 55.8 ± 12.8 for AF, 85 ± 10.6 vs. 67.4 ± 10.6 for ILF, 76 ± 15.8 vs. 72.5 ± 10.6 for IFOF, and 77.6 ± 13.6 vs. 66.2 ± 18.1 for UF.