Discharge diagnoses of admitted nonagenarians by hospital length of stay (percentage in parentheses).

*All continuous variables were expressed in mean ± standard deviation, while dichotomized variables were expressed in frequency and percentages.
$Including oncologic or endocrinologic illnesses.
Abbreviations: COPD, chronic obstructive pulmonary disease; AE, acute exacerbation; HF, heart failure; UGI, upper gastrointestinal tract; LGI, lower gastrointestinal tract; UTI, urinary tract infection; AKI, acute kidney injury.