Characteristics, laboratory parameters and outcomes of non-obese, obese and morbidly obese patients with influenza A(H1N1)pdm09 admitted to intensive care unit during the first pandemic wave.

Definitions of abbreviations: APACHE = Acute Physiology, Age, and Chronic Health Evaluation; ARDS = Acute respiratory distress syndrome; AUD = Australian dollar; BMI = Body mass index (calculated as weight in kilograms divided by height in metres squared); ECMO = Extracorporeal membrane oxygenation; ICU = Intensive care unit; IQR = Interquartile range; SD = Standard deviation; SEIFA = Socioeconomic indexes for areas.*Obese BMI ≥30 kg/m2.+Morbidly obese BMI ≥40 kg/m2.