Table 1.

Multivariate Weighted Odds Ratios (OR) and 95% Confidence Interval (95% CI) for Behavioral Measures Based on Sleep Duration (Unadjusted Model) and After Controlling for Potentially Confounding Variables (Adjusted Model) in the Final Logistic Regression Model^*

Risk factors	Hyperactivity-impulsivity High (n=173†/n=129‡)			Inattention High (n=124†/n=124‡)			Daytime sleepiness Yes (n=266†/n=265‡)
	OR	95% CI	P	OR	95% CI	P	OR	95% CI	P
	Unadjusted model†
Sleep duration patterns§
Short persistent duration	1.6	(0.8 – 3.0)	0.16	1.2	(0.6 – 2.5)	0.68	1.3	(0.7 – 2.4)	0.41
Short increasing duration	2.4	(1.3 – 4.4)	0.008	0.7	(0.3 −2.0)	0.56	1.1	(0.6 – 2.2)	0.75
10-h persistent duration	1.1	(0.7 – 1.5)	0.73	0.9	(0.6 – 1.3)	0.59	1.0	(0.7 – 1.3)	0.75
			n=1,391			n=1,391			n=1,258
Adjusted model‡
Sleep duration patterns§
Short persistent duration	1.5	(0.7 – 3.2)	0.25	1.1	(0.5 – 2.4)	0.76	1.2	(0.7 – 2.2)	0.44
Short increasing duration	3.2	(1.6 −6.6)	0.001	0.7	(0.3 – 2.0)	0.55	1.0	(0.5 – 2.0)	0.96
10-h persistent duration	1.2	(0.8 – 1.8)	0.46	0.9	(0.6 – 1.3)	0.47	0.9	(0.7 – 1.2)	0.57
			n=1,169			n=1,386			n=1,251

Data courtesy of the Quebec Institute of Statistics.

^*Data are expressed as weighted odds ratio (95% confidence interval).

^§The reference for sleep duration patterns in the logistic regression was children who slept 11-hour persistently.

^†Unadjusted odds ratio (95% CI) without controlling for potentially confounding factors.

^‡Adjusted odds ratio (95% CI) while controlling for sex of the child, low birth weight, breastfeeding status, maternal immigrant status, low parental education, young mother age, inadequate income, naptime at 29 months of age, hyperactivity-impulsivity and inattention at 17 months of age.