Impact of body mass index on hospital mortality of old and oldest- old critically ill patients: a retrospective study.

For individuals aged over 90, the underweight had a higher hospital mortality rate than the normal weight ( p < 0.05), while the overweight and obese showed an increasing trend in hospital mortality compared to the normal weight without significant differences ( p > 0.05).

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In the age group 80 to 90, the underweight showed a trend of increased mortality compared to the normal weight, without reaching statistical significance ( p < 0.05).

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The overweight had a lower hospital mortality than the normal weight, and the obese showed a decreasing trend in hospital mortality without significant differences ( p > 0.05).

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