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Table 2 Baseline clinical and socio-demographic characteristics of the study participants by sleep duration categories

From: Circadian CLOCK gene polymorphisms in relation to sleep patterns and obesity in African Americans: findings from the Jackson heart study

Variables

 

Short (< 6 h) 730 (24.95%)

Medium (6–8 h) 2041 (69.75%)

Long (>8 h) 155(5.30%)

P value

Age (years)

 

53.69 ± 12.51

54.37 ± 12.82

58.31 ± 13.6

0.0002

PEA

 

0.163 ± 0.08

0.178 ± 0.09

0.173 ± 0.08

0.0006

Annual household income

 

<$20,000

26.84%

25.22%

51.52%

<.0001

 

$20,000–50,000

38.78%

37.62%

28.03%

 

>$50,000

34.38%

37.16%

20.45%

Smoking status

 

Former/never smoker

83.33%

87.77%

81.94%

0.003

 

Current smoker

16.67%

12.23%

18.06%

alcohol consumption

 

Former/never drinker

49.73%

51.94%

66.45%

0.007

 

Current drinker

50.27%

48.06%

33.55%

Leptin (ng/mL)

 

29.61 ± 27.02

27.78 ± 23.51

29.49 ± 24.23

0.185

Adiponectin (μg/mL)

 

5.16 ± 4.22

5.30 ± 4.16

5.63 ± 4.57

0.42

BMI (kg/m2)

 

32.61 ± 7.75

31.88 ± 7.34

31.38 ± 7.19

0.03

Normal-weight (BMI < 25)

 

12.88%

13.42%

16.77%

 

Overweight/Obese (BMI ≥ 25)

 

87.12%

86.58%

83.23%

 
  1. Data presented as mean ± SD or as percentages.. P-values are calculated based on one-way ANOVA for continuous variables and X2 for categorical variables. BMI: body mass index; PEA; proportion of global European ancestry