Inclusion Criteria:  All admitted adult patients with covid PCR positive result Those who developed barotrauma were labeled as "Cases" and those without barotrauma were "Controls".  Exclusion Criteria:  Adult patients with covid PCR positive result who were discharged from Emergency department. Adult patients with covid PCR positive result who died or left against medical advice before admission to ward/ICU Adult patients with covid PCR positive result who were shifted to other hospitals and their follow up could not be completed.