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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