Table 3.

Logistic regression model of delirium risk (N=132)

	Model 1		Model 2		Model 3		Model 4
	OR (95% CI)	p-value	OR (95% CI)	p-value	OR (95% CI)	p-value	OR (95% CI)	p-value
PA (days per week)	0.88 (0.75–1.02)	0.11	*	*	*	*	*	*
Cognitive activities per weekb	0.92 (0.87–0.98)	0.01	*	*	*	*	*	*
Regular PA a	*	*	0.26 (0.08–0.82)	0.02	0.35 (0.12–0.99)	0.05	0.33 (0.12–0.92)	0.03
Regular cognitive activitiesc	*	*	0.19 (0.04–0.89)	0.04	0.19 (0.04–0.88)	0.03	*	*
Age	0.97 (0.91–1.03)	0.37	0.98 (0.92–1.04)	0.48	0.97 (0.91–1.04)	0.38	0.97 (0.92–1.03)	0.39
Female sex	0.78 (0.32–1.88)	0.58	0.67 (0.28–1.64)	0.39	0.68 (0.28–1.66)	0.40	0.67 (0.28–1.59)	0.37
MMSEd	0.68 (0.54–0.86)	<0.01	0.64 (0.51–0.81)	<0.01	0.66 (0.52–0.84)	<0.01	0.62 (0.49–0.78)	<0.01
CCI e	0.79 (0.53–1.19)	0.26	0.80 (0.53–1.20)	0.29	0.77 (0.51–1.16)	0.21	0.75 (0.50–1.12)	0.16

Model 1: Days per week of physical activity and number of cognitive activities per week as continuous variables

Model 2: Regular physical activity and cognitive activities are dichotomized: Regular PA defined as 6–7 days activity per week; Regular cognitive activities defined as 21 or more activities per week

Model 3: Regular PA defined as 5–7 days of PA per week

Model 4: Cognitive activities are removed from the model with minimal change in OR for regular PA

^aRegular Physical Activity defined as 6–7 days per week in Model 2 and defined as 5–7 days in Model 3

^bOn a scale of 0–41 unit activities per week

^cRegular Cognitive Activity defined as 21 or more activities per week

^dMini Mental Status Examination score, range from 0–30

^eCharlson Comorbidity Index

^*omitted from model