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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)