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).