Table 3. Multivariable logistic regression analysis for ADL improvement and multiple linear regression analysis for length of hospital stay between patients aged ≥90 and 80 to 89 years.

	ADL improvement			Length of hospital stay, days
	Odds ratio*	95% Confidence interval	P value	Coefficient*	95% Confidence interval	p value
80–89 years	reference			reference
≥90 years	0.33	0.29–0.36	<0.001	−0.84	−1.01–−0.67	<0.001

*adjusted for sex, Charlson comorbidity index and BI score at admission

ADL, activities of daily living: BI, Barthel index.