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Table 1 Demographic, medical, and lifestyle characteristics by cognitive status

From: Effect of sunlight exposure on cognitive function among depressed and non-depressed participants: a REGARDS cross-sectional study

Characteristics

All Subjects

(N = 16800)

Missing

Intact Cognitive Status

(N = 15421; 92%)

Impaired Cognitive Status

(N = 1379; 8%)

p-value

 

N (%)

N

N (%)

N (%)

 

Demographics

     

   Male

6657 (40)

0

6033 (39)

624 (45)

<0.0001

   Education

 

19

   

Less than High School

2081 (12)

 

1719 (11)

362 (26)

 

High School

4404 (26)

 

3978 (26)

426 (31)

<0.0001

Some College

4525 (27)

 

4230 (27)

305 (22)

 

College Diploma

5761 (34)

 

5480 (36)

281 (20)

 

   Age

 

5

   

Less than 55 years

2077 (12)

 

1982 (13)

95 (7)

 

55 to 59 years

2908 (17)

 

2756 (18)

152 (11)

 

60 to 64 years

3197 (19)

 

3009 (20)

188 (14)

<0.0001

65 to 69 years

3117 (19)

 

2870 (19)

247 (18)

 

70 to 74 years

2418 (14)

 

2172 (14)

246 (18)

 

75 to 79 years

1765 (11)

 

1536 (10)

229 (17)

 

80 or more years

1313 (8)

 

1091 (7)

222 (16)

 

   Income

 

2171

   

Less than $20,000/year

3097 (21)

 

2698 (20)

399 (35)

 

$20,000–35,000/year

4017 (27)

 

3633 (27)

384 (33)

<0.0001

$35,000-$75,000/year

4968 (34)

 

4678 (35)

290 (25)

 

Over $75,000/year

2547 (17)

 

2467 (18)

80 (7)

 

   Region

 

0

   

Non Belt/Buckle

7850 (47)

 

7211 (47)

639 (46)

0.13

Stroke Belt

6095 (36)

 

5567 (36)

528 (38)

 

Stoke Buckle

2855 (17)

 

2643 (17)

212 (15)

 

   Population Density

 

0

   

Urban

13532 (81)

 

12365 (80)

1167 (85)

 

Mixed

1678 (10)

 

1571 (10)

107 (8)

0.0003

Rural

1590 (9)

 

1485 (10)

105 (8)

 

   Season

 

0

   

Spring

3610 (22)

 

3260 (21)

350 (25)

<0.0001

Summer

6439 (38)

 

5998 (39)

441 (32)

 

Fall

3410 (20)

 

3181 (21)

229 (17)

 

Winter

3341 (20)

 

2982 (19)

359 (26)

 

Medical Factors

     

   BMI

 

238

   

Underweight

212 (1)

 

189 (1)

23 (2)

 

Normal

3973 (24)

 

3651 (24)

322 (24)

0.26

Overweight

5970 (36)

 

5462 (36)

508 (38)

 

Obese

6407 (39)

 

5906 (39)

501 (37)

 

   Diabetic

3527 (22)

623

3150 (21)

377 (29)

<0.0001

   Hypertensive

9854 (59)

73

8943 (58)

911 (67)

<0.0001

   High Cholesterol

1740 (10)

80

1595 (10)

145 (11)

0.85

   Depressed

1877 (11)

155

1624 (11)

253 (18)

<0.0001

   PCS-12 (mean, stddev)

46.1 (10.6)

0

46.3 (10.5)

44.0 (11.0)

<.0001

Lifestyle Factors

     

   Never Used Alcohol

5129 (31)

0

4606 (30)

523 (40)

<0.0001

   No weekly exercise

5948 (36)

234

5359 (35)

589 (44)

<0.0001

   Smoking

 

67

   

Current

2445 (15)

 

2227 (15)

218 (16)

0.18

Past

6609 (40)

 

6055 (39)

554 (40)

 

Never

7679 (46)

 

7078 (46)

601 (44)

 
  1. stddev = standard deviation; BMI = Body Mass Index; PCS = Physical Components Summary
  2. P-values for categorical variables provided from a chi squared test statistic and for continuous variables provided from a scatterthwaite t-test statistic calculated for each variable by cognitive status.
  3. P-values in bold indicate values that are significant at α = 0.05.