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1. The table shows number of patients. The figures in parentheses are the column percentages within each categorical covariate. For continuous covariates median and range are presented
2. ICU: intensive care unit; SpO2 : saturation of peripheral oxygen; RR: respiratory rate; BP: systolic blood pressure; HR: heart rate; GCS: Glasgow Coma Score; Admission time: day = 08.00-1559 hours; evening = 16.00-23.59 hours; night = 00.00-07.59 hours