Table 3

Associations between sleep duration (hours per day) and body composition measures in participants of the OSSLS2
Total sample (n = 685) Girls (n = 299) Boys (n = 386)
Model 1 Model 2 Model 4 Model 4
Coef (95% CI) P Coef (95% CI) P Coef (95% CI) P-value Coef (95% CI) P
BMI z-score1
  Average sleep duration −0.06 (−0.15, 0.03) 0.20 −0.06 (−0.15, 0.04) 0.24 0.03 (−0.13, 0.20) 0.69 −0.11 (−0.20, -0.02) 0.02
  Weekday sleep duration −0.04 (−0.12, 0.04) 0.30 −0.04 (−0.12, 0.04) 0.33 0.05 (−0.11, 0.21) 0.56 −0.09 (−0.18, -0.01) 0.02
  Weekend sleep duration −0.03 (−0.08, 0.01) 0.17 −0.03 (−0.08, 0.02) 0.21 −0.02 (−0.12, 0.08) 0.72 −0.04 (−0.11, 0.03) 0.29
Waist circumference2
  Average sleep duration −0.67 (−1.57, 0.23) 0.14 −0.68 (−1.61, 0.27) 0.163 0.28 (−1.03, 1.60) 0.68 −1.17 (−2.01, -0.32) 0.01
  Weekday sleep duration −0.39 (−1.09, 0.32) 0.28 −0.41 (−1.15, 0.34) 0.28 0.33 (−1.14, 1.82) 0.66 −0.79 (−1.32, -0.26) 0.01
  Weekend sleep duration −0.51 (−1.10, 0.09) 0.09 −0.49 (−1.11, 0.13) 0.12 −0.05 (−0.92, 0.83) 0.91 −0.69 (−1.40, 0.02) 0.06
WHtR2
  Average sleep duration −0.44 (−1.20, 0.32) 0.26 −0.42 (−1.24, 0.41) 0.323 0.47 (−0.69, 1.64) 0.43 −0.92 (−1.64, -0.19) 0.01
  Weekday sleep duration −0.24 (−0.83, 0.36) 0.44 −0.21 (−0.86, 0.45) 0.54 0.42 (−0.80, 1.66) 0.50 −0.57 (−1.17, 0.03) 0.06
  Weekend sleep duration −0.36 (−0.86, 0.14) 0.16 −0.37 (−0.92, 0.18) 0.18 0.14 (−0.72, 1.01) 0.75 −0.60 (−1.19, 0.01) 0.05
Fat mass index2
  Average sleep duration −1.87 (−6.06, 2.49) 0.40 −1.85 (−5.82, 2.29) 0.383 2.40 (−2.08, 7.08) 0.30 −4.54 (−8.29, -0.63) 0.02
  Weekday sleep duration −1.11 (−4.51, 2.42) 0.53 0.82 (−3.98, 2.44) 0.623 2.30 (−2.27, 7.09) 0.33 −2.98 (−5.81, -0.07) 0.05
  Weekend sleep duration −1.39 (−3.70, 1.98) 0.25 −1.77 (−4.14, 0.66) 0.153 0.44 (−1.08, 1.98) 0.57 −2.84 (−5.71, 0.11) 0.06
Fat-free mass index2
  Average sleep duration −0.88 (−1.74, 0.01) 0.05 −0.79 (−1.68, 0.10) 0.083 0.16 (−1.04, 1.36) 0.80 −1.40 (−2.29, -0.50) 0.01
  Weekday sleep duration −0.50 (−1.15, 0.16) 0.15 −0.49 (−1.19, 0.21) 0.17 0.26 (−1.07, 1.61) 0.70 −1.00 (−1.68, -0.32) 0.01
  Weekend sleep duration −0.77 (−1.25, -0.10) 0.02 −0.56 (−1.14, 0.03) 0.06 −0.16 (−0.72, 0.41) 0.59 −0.75 (−1.53, 0.04) 0.06

WHtR = Waist Circumference (cm) to Height (cm) ratio; Model 1 = GEE regression adjusted for age and sex.

Model 2 = GEE regression adjusted for age, sex, school decile, ethnicity, F&V recommendation and number of screens in the bedroom.

Model 4 = GEE regression adjusted for age, school decile, ethnicity, F&V recommendation and number of screens in the bedroom.

1Expected change in mean BMI z-score for every hour increase in sleep.

2Expected percentage change in mean body composition for every hour increase in sleep.

3Significant sex by sleep variable interaction observed in Model 3 (See Figure 2 for model results that include a significant interaction term for Average Sleep Duration).

Skidmore et al.

Skidmore et al. Nutrition Journal 2013 12:128   doi:10.1186/1475-2891-12-128

Open Data