Table 3.

Crude logistic univariate relationships of cognitive impairment with predictors and final covariates

Characteristics	OR (95% CI)
Primary Variable of Interest
Same day solar radiation (by 5,000 KJ/m2/day)
<10,000 J/m2	1.15 (0.96–1.38)
10,000–15,000 J/m2	1.02 (0.86–1.21)
15,000–20,000 J/m2	0.96 (0.82–1.13)
20,000–25,000 J/m2	1.03 (0.88–1.21)
>25,000 J/m2	1.00 (Referent)
	CMH chisq p = 0.4346
2 week solar radiation (by 5,000 KJ/m2/day)
<10,000 J/m2	1.36 (1.08–1.70)
10,000–15,000 J/m2	1.13 (0.95–1.33)
15,000–20,000 J/m2	1.09 (0.92–1.30)
20,000–25,000 J/m2	1.01 (0.86–1.19)
>25,000 J/m2	1.00 (Referent)
	CMH chisq p = 0.0075
Covariates
Male	1.29 (1.15–1.44)
Education
Less than High School	4.56 (3.57–5.83)
High School	3.26 (2.55–4.17)
Some College	1.91 (1.49–2.46)
College Diploma	1.00 (Referent)
	CMH chisq p < .0001
Income
Less than $20,000 per year	4.47 (3.46–5.77)
$20,000 to $35,000 per year	3.21 (2.49–4.15)
$35,000 to $75,000 per year	1.88 (1.45–2.45)
$75,0000 or more per year	1.00 (Referent)
	CMH chisq p < .0001
Age
Less than 55 years	1.00 (Referent)
55 to 59 years	1.15 (0.89–1.50)
60 to 64 years	1.30 (1.01–1.68)
65 to 69 years	1.80 (1.41–2.29)
70 to 74 years	2.36 (1.85–3.02)
75 to 79 years	3.11 (2.43–3.99)
80 or more years	4.25 (3.30–5.46)
	CMH chisq p < .0001
Region
Non Belt/Buckle	1.00 (Referent)
Stroke Belt	1.07 (0.95–1.21)
Stoke Buckle	0.91 (0.77–1.06)
Season
Summer	1.00 (Referent)
Fall	0.98 (0.83–1.16)
Winter	1.64 (1.42–1.90)
Spring	1.46 (1.26–1.69)
Depressed	1.90 (1.65–2.20)
PCS-12 (by 10 unit increase)	0.82 (0.78–0.86)
Never Used Alcohol	1.44 (1.28–1.61)

OR = odds ratio; CI = confidence interval; PCS = Physical Components Summary

CMH chisq = Cohran-Mantel-Haenzel chi-squared

ORs in bold have CI's which do not overlap a null value