Table 1.

Stratified univariate Cox regression analysis to estimate the hazard ratios for developing dementia after propensity score matching.

Variable	HR	95% CI	p-value	VIF
Model 1
Delirium	3.75	1.24-11.30	0.019*
Model 2
Delirium	5.29	1.35-20.75	0.017*	1.38
Number of drug	0.97	0.90-1.04	0.380	1.21
Fall	0.26	0.01-5.65	0.391	1.22

CI, confidence interval; HR, hazard ratio; VIF, variance inflation factor. ^*p < 0.05.