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Table 4 Associations between sleep duration and measurements of body size and composition, NHANES 2005–2006

From: Relationship between sleep characteristics and measures of body size and composition in a nationally-representative sample

  Sleep duration, hour p for trend
β (95 % CI) ≤5 6 7 8 ≥9
BMI (kg/m2)
 age and sex adjusted 2.20 (0.87, 3.52) 1.19 (0.37, 2.01) 0.41 (−0.31, 1.13) ref 0.29 (−1.37, 1.95) 0.001
 multivariablea 1.82 (0.66, 2.98) 1.07 (0.36, 1.78) 0.45 (−0.23, 1.13) ref 0.20 (−1.32, 1.73) 0.001
 multivariable b 1.55 (0.28, 2.82) 0.64 (−0.10, 1.38) 0.24 (−0.47, 0.95) ref 0.23 (−1.26, 1.72) 0.005
Percent body fat
 age and sex adjusted 1.35 (0.23, 2.48) 0.46 (−0.42, 1.34) 0.34 (−0.28, 0.96) ref 1.02 (−0.52, 2.57) 0.18
 multivariablea 1.48 (0.51, 2.45) 0.54 (−0.15, 1.24) 0.47 (−0.07, 1.00) ref 1.06 (−0.39, 2.52) 0.07
 multivariableb 1.09 (0.15, 2.04) 0.09 (−0.64, 0.82) 0.22 (−0.40, 0.84) ref 0.79 (−0.07, 1.63) 0.36
Waist circumference (cm)
 age and sex adjusted 4.28 (1.18, 7.38) 1.84 (−0.11, 3.79) 0.78 (−0.82, 2.38) ref 0.02 (−3.21, 3.26) 0.006
 multivariablea 3.69 (0.91, 6.46) 1.71 (0.10, 3.31) 0.95 (−0.54, 2.44) ref −0.23 (−3.25, 2.79) 0.004
 multivariableb 3.15 (−0.07, 4.19) 1.30 (−0.38, 2.99) 0.49 (−0.91, 1.88) ref −0.34 (−2.95, 2.26) 0.04
Android/Gynoid fat ratio
 age and sex adjusted 0.02 (−0.02, 0.05) 0.00 (−0.04, 0.03) −0.01 (−0.03, 0.01) ref −0.02 (−0.05, 0.02) 0.35
 multivariablea 0.02 (−0.02, 0.06) 0.00 (−0.03, 0.03) −0.01 (−0.03, 0.02) ref −0.02 (−0.06, 0.01) 0.08
 multivariableb 0.00 (−0.03, 0.04) −0.01 (−0.04, 0.01) −0.02 (−0.04, 0.01) ref −0.02 (−0.06, 0.02) 0.74
  1. aadjusted for age, sex, race/ethnicity, smoking status, alcohol drinking, education, intakes of fat, carbohydrate and total calories, physical activity and diabetes
  2. badjusted for covariates in aas well as snoring and sleep quality