outcome(7) obesity(7) COVID-19(7) Result(6) severity of COVID-19(6) treated(5) Patient(5) Analysis(5) risk(5) Factor(5) analyzed(5) Effect(5) died(4) Respiratory failure(4) risk factor(4) mortality rate(4) Odds ratio(4) Oxygen administration(4) independent risk factor(4) defined(4) disease severity(4) the patient(4) SARS-CoV-2(4) Japan(4) patients with COVID-19(4) Critical(4) critical cases(4) no difference(4) benefit(4) reported(4)