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We aimed to investigate the association between body mass index (BMI) at the time of intensive care unit (ICU) admission and 90-day mortality risk in complete-case datasets that ignore missing data as well as in datasets with multiple imputation for missing data. This retrospective study analysed the medical records of adult patients admitted to ICUs in a single tertiary academic hospital. For BMI analysis, data were classified into four groups underweight (20 kg/m2 ), normal (20-24.9 kg/m2 ), overweight (25-29.9 kg/m2 ), and obese (≥