Table 3 Crude logistic univariate relationships of cognitive impairment with predictors and final covariates

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)