Clinical features of admitted nonagenarians by length of hospital 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: CAD, coronary artery disease; AMI, acute myocardial infarction; HF, heart failure; PAOD, peripheral artery occlusive disease; PUD, peptic ulcer disease; COPD, chronic obstructive pulmonary disease; CVA, cerebrovascular accident; CKD, chronic kidney disease; AE, acute exacerbation; UGI, upper gastrointestinal tract; LGI, lower gastrointestinal tract; UTI, urinary tract infection; AKI, acute kidney injury.