Fig. 3

The patients with a wide QRS complex and type 2 diabetes mellitus (T2DM) had higher levels of fibroblast growth factor 21 (FGF21) than those without a wide QRS complex and T2DM and those without a wide QRS complex and without T2DM (A). Furthermore, the patients with a prolonged QTc interval and T2DM had higher levels of FGF21 than those without a prolonged QTc interval with T2DM and those without a prolonged QTc interval and without T2DM (B). Differences between groups were analyzed by one-way analysis of variance, followed by Tukey’s pairwise comparison. The bottom of the box plots indicates the 25th percentile and the top indicates the 75th percentile. The middle line of the box indicates the median. The lower and upper ends of the whiskers indicate the minimum and maximum observations below the upper fence (1.5 interquartile range above the 75th percentile), respectively