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Table 1 Characteristics of study population (n = 303)

From: A cross-sectional analysis of light at night, neighborhood sociodemographics and urinary 6-sulfatoxymelatonin concentrations: implications for the conduct of health studies

Characteristics Distribution
Age at urine collection, years (mean,standard deviation) 55.0 (11.9)
BMI at urine collection, kg/m2 (mean,standard deviation) 26.6 (5.8)
Height at CTS baseline survey, inches (mean,standard deviation) 65.0 (2.7)
Packyears of smoking (mean,standard deviation) 4.0 (10.0)
Pillyears of aspirin use (mean,standard deviation) 0.69 (2.0)
Coffee consumption, average grams/day (mean,standard deviation) 238.2 (184.7)
Coffee consumption, average times/day (mean,standard deviation) 0.97 (0.72)
Strenuous exercise, 3-years prior to baseline, hours/wk (mean,standard deviation) 1.6 (2.4)
Strenuous exercise, lifetime prior to baseline, hours/wk (mean,standard deviation) 2.2 (2.3)
Age at first full-term pregnancy, years (mean,standard deviation) 27.0 (4.9)
Parity, total number of live and still births (mean,standard deviation) 1.7 (1.4)
Race/ethnicity (n,%)  
 Non-Hispanic white 258 (85.1)
 Hispanic 18 (5.9)
 Black 3 (1.0)
 Asian & Pacific Islander 13 (4.3)
 Other/unknown 11 (3.6)
Menopausal Status, at baseline(n,%)  
 Postmenospausal 131 (43.2)
 Premenopausal or Perimenopausal 147 (48.5)
 Unknown 25 (8.3)
Alcohol Consumption, year prior to baseline (n, %)  
 None 86 (28.4)
 <20 g/day 176 (58.1)
 ≥20 g/day 27 (8.9)
 Unknown 14 (4.6)
Tobacco Smoke Exposure, at baseline (n, %)  
 None 61 (20.1)
 Passive only 142 (46.9)
 Former active smoker 86 (28.4)
 Current active smoker 12 (4.0)
 Unknown 2 (0.7)
Oral contraceptive use, at baseline (n, %)  
 Never 81 (26.7)
 Former 198 (65.4)
 Current 16 (5.3)
 Unknown 8 (2.6)
Antidepressant use, daily use for at least 2 months at baseline  
 Yes 29 (9.6)
 No 237 (78.2)
 Unknown 37 (12.2)
Hormone therapy use, at baseline (n, %)  
 Premenopausal 142 (46.9)
 Peri/post-menopausal, never used 34 (11.22)
 Peri/post-menopausal, prior use 16 (5.3)
 Peri/post-menopasual, current use 71 (23.4)
 Other/unknown 40 (13.2)
Regular aspirin use, years at baseline  
 None 240 (79.2)
 <1 11 (3.6)
 1 2 (0.7)
 2 4 (1.3)
 3-4 7 (2.3)
 5-9 6 (2.0)
 10+ 31 (10.2)
 Unknown/missing 2 (0.7)
Regular aspirin use, days/week at baseline  
 None 240 (79.2)
 1-3 41 (13.5)
 4-6 9 (3.0)
 7 12 (4.0)
 Unknown 1 (0.3)
Daily Use of Calcium Blockers, in 2000  
 Yes 4 (1.3)
 No 246 (81.2)
 Unknown 53 (17.5)
Neighborhood Urbanization  
 Urban 120 (39.6)
 Rural 183 (60.4)
Hours of sleep/night  
 <5 hours 3 (1.0)
 5-6 hours 63 (20.8)
 7-9 hours 226 (74.6)
 10+ hours 4 (1.3)
 Unknown 7 (2.3)
Neighborhood Socioeconomic Status (mean, range)  
 Median Family Income ($) 76,782 (37,337-140,387)
 Percent of population below poverty level 6.8 (0.0 – 37.6)
 Percent of adults age 25+ with college degree 34.3 (1.5 – 79.0)
 Percent of adults without a high school degree 14.6 (1.2 – 56.8)
 Percent of adults employed in a professional occupation 44.3 (6.7-74.3)