Sleep duration and adiposity in older adolescents from Otago, New Zealand: relationships differ between boys and girls and are independent of food choice

Skidmore, Paula ML; Howe, Anna S; Polak, Maria A; Wong, Jyh Eiin; Lubransky, Alex; Williams, Sheila M; Black, Katherine E

doi:10.1186/1475-2891-12-128

Table 3 Associations between sleep duration (hours per day) and body composition measures in participants of the OSSLS2

From: Sleep duration and adiposity in older adolescents from Otago, New Zealand: relationships differ between boys and girls and are independent of food choice

	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).

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