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Table 1 Baseline Study Characteristics According to LAN at 1996 among 239,781 participants in the National Institutes of Health-AARP Diet and Health Study

From: A large prospective investigation of outdoor light at night and obesity in the NIH-AARP Diet and Health Study

 

LAN at 1996

Characteristics

Q1

Q2

Q3

Q4

Q5

LAN, nW/cm2/sr, Median (Range)

5.3 (0.7, 9.6)

14.2 (9.7, 20.2)

27.2 (20.3, 35.1)

44.6 (35.2, 57.0)

73.8 (57.1, 220.7)

Age at baseline, year, mean (SD)

62.0 (5.3)

61.9 (5.3)

61.9 (5.3)

62.0 (5.3)

61.8 (5.4)

BMI, kg/m2, mean (SD)

27.0 (4.4)

27.0 (4.5)

26.8 (4.4)

26.9 (4.6)

27.0 (4.8)

Female, %

37.9

38.2

39.0

41.7

46.2

White, non-Hispanic, %

96.3

95.0

94.0

92.8

84.5

College and post-college, %

38.0

44.2

48.0

47.0

41.5

Married, %

78.2

74.4

71.9

68.3

59.4

Obesity (at baseline), %

20.5

20.5

19.8

20.4

22.3

Smoking, %

 Current

9.2

8.9

9.0

9.1

10.7

 Never

38.4

37.9

38.3

38.4

37.9

Physical activity ≥5 times/week, %

21.6

20.8

20.3

19.6

18.2

TV viewing ≤2 h/day, %

35.8

36.6

38.7

38.3

36.1

Nighttime sleep 7–8 h, %

46.9

45.0

44.2

43.3

40.1

Alcohol consumption, g/day, mean (SD)

13.1 (35.4)

12.9 (32.9)

13.0 (32.7)

12.7 (33.5)

12.0 (35.6)

Total energy, kcal/d, mean (SD)

1883 (886)

1849 (832)

1830 (839)

1811 (867)

1826 (944)

HEI-2005 score, mean (SD)

66.9 (11.1)

67.3 (11.0)

67.6 (11.0)

67.8 (11.1)

67.5 (11.3)

Self-reported health, excellent, %

17.9

19.4

20.2

19.6

17.8

Chronic conditions, %

 Heart disease

12.6

12.2

11.8

11.7

11.3

 Stroke

1.6

1.5

1.4

1.5

1.4

 Cancer

7.6

7.7

8.0

8.0

7.6

 Diabetes

7.1

7.2

7.0

7.0

7.8

Census tract median home value, 1kUSD, mean (SD)

154 (121)

190 (157)

214 (159)

213 (149)

198 (145)

Census tract poverty rate, percentage, mean (SD)

8.5 (6.0)

6.9 (5.8)

6.6 (5.9)

7.1 (6.1)

10.3 (8.0)

Census tract population density, per km2, mean (SD)

304 (428)

898 (740)

1416 (1079)

1999 (1392)

3685 (3222)

  1. Abbreviations: IQR interquartile range, HEI healthy eating index, LAN light at night, SD standard deviation