Fig. 3 Risk of oxygen therapy, treatment in intensive care unit, use of invasive mechanical ventilation, and critical illness (treatment in intensive care unit or using invasive mechanical ventilation or hospital death) according to body mass index (BMI). Forest plot of adjusted odds ratio and 95% con fi dence intervals according to BMI category by multivariate logistic regression analyses. Outcomes were adjusted for BMI groups, age, sex, and presence of comorbidities such as hypertension, diabetes, prior cardiovascular disease, and chronic kidney