Fig. 1From: Risk factors of pneumothorax and pneumomediastinum in COVID-19: a matched case–control studyThe number of COVID-19 patients and PNX/PNM cases by month during the study period. No patients were admitted to the critical unit from April to May 2020; COVID-19, coronavirus disease-2019; PNX/PNM, pneumothorax/pneumomediastinumBack to article page