Fig. 5

Forest plots comparing of the proportion of patients with elevated lactate dehydrogenase levels in the severe disease/ICU group and in the non-severe disease/non-ICU group (a), the lactate dehydrogenase levels in the severe disease/ICU group and in the non-severe disease/non-ICU group (b), and the lactate dehydrogenase levels in the survivors and non-survivor groups (c). ICU, intensive care unit; RR, risk ratios; SMD, standard mean