Fig. 2.

The distribution of alcohol intake among 234,392 Norwegian health survey participants and the relationship between alcohol intake and the risk of atrial fibrillation (5043 incident events) during a mean (SD) follow-up time of 8.7(1.2) years. Obtained using Cox proportional hazard model with age, sex, and alcohol intake fitted as a penalized smoothed spline. The solid line shows the spline and the stipulated lines depict twice the standard error (approximately a 95% CI). The distribution of the frequency of participants by alcohol intake is superimposed (in grey).