Figure 2.

Comparison of night/evening shifts and days with over 10 h of work between cases and controls. (A) Number of night shifts per month in the SCA case and healthy control groups. An asterisk (*) denotes an outlier, which is an observation that falls outside the outer fence of the box plot. And a circle (○) denotes an anomaly, which is an observation that falls outside the inner fence of the box plot. (B) Number of evening shifts per month in the SCA case and healthy control groups. (C) Number of days with over 10 h of work per month in the SCA case and healthy control groups. In all analyses, the SCA case group showed a significantly higher frequency, with p-values of 0.014, 0.004, and <0.001, respectively. SCA: sudden cardiac arrest.