IL6 and atrial fibrillation: Compared to the lowest IL-6 quartile, the adjusted HRs (95% CI) for AF were 1.05 (0.84–1.32), 1.33 (1.06–1.67) and 1.42 (1.10–1.82) for the 2nd, 3rd and 4th quartiles respectively, and was 1.12 (1.05–1.19) per 1 SD increment in IL-6.