Table 5.

Mediation Effect of Leptin on the Association of Sleep Duration With Cardiometabolic Risk Factors in 6–12 Years Old.

	Coefficient	Bootstrapped 95% confidence intervals	Proportion mediated (% of total effect)
BMI	−0.429	(−0.611 to −0.263)	81.6
WC (cm)	−1.088	(−1.537 to −0.602)	85.8
FAT%	−0.856	(−1.220 to −0.503)	—a
FBG (mmol/L)	−0.006	(−0.010 to −0.002)	10.0
ln insulin	−0.056	(−0.078 to −0.033)	71.5
ln HOMA-IR	−0.057	(−0.082 to −0.032)	63.0
HDL-C (mmol/L)	0.014	(0.007 to 0.021)	65.0

Models were adjusted for age, gender, Tanner stage, family history, diet, physical activity, parental education, vocation, and residence.

BMI = body mass index; FAT% = fat mass percentage; FBG = fasting blood-glucose; HDL-C = high-density lipoprotein cholesterol; HOMA-IR = homeostasis model assessment of insulin resistance; WC = waist circumference.

^aProportion mediated is undefined because the point estimate of the mediated effect is not in the same direction as the direct effect.

Values in bold are significant at p < .05.