Fig. 6

Forest plots comparing of the risk of developing to severe disease or requiring ICU admission among patients with or without newly occurring arrhythmias (a), the interleukin-6 levels in the severe disease/ICU group (b), and in the non-severe disease/non-ICU group and the interleukin-6 levels in the survivors and non-survivors groups (c). ICU, intensive care unit; RR, risk ratios; SMD, standard mean