Pre-operative hemoglobin level and use of sedative-hypnotics are independent risk factors for post-operative delirium following total knee arthroplasty

Table 4 Multivariate logistic regression analysis of risk factors of delirium. Use of sedative-hypnotics and pre-operative Hb level were independent risk factors for developing post-operative delirium. The adjusted odds ratios for the use of sedative-hypnotics and pre-operative Hb level were 4.6 and 0.53, respectively

	Odds ratio	95% CI	P-Value
Age (years)	1.08	0.99-1.20	0.08
Use of sedative-hypnotics	4.61	1.11-20.2	0.035^*
Pre-operative levels of Hb (g/dl)	0.53	0.31-0.87	0.011^*
Post-operative day 3 BUN (mg/dl)	1.05	0.98-1.13	0.171

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