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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