Fig. 1From: Comparison of clinical characteristics and hospital mortality in critically ill patients without COVID-19 before and during the COVID-19 pandemic: a multicenter, retrospective, propensity score-matched studyPatient numbers and their causes of admission (a) and severity at admission (b) before and during the COVID-19 pandemic. *p < 0.05, compared before and during the COVID-19 pandemic. COVID-19, coronavirus disease 2019Back to article page