Secondhand Smoke Exposure, Restless Sleep, and Sleep Duration in Adolescents

Table 2

Odds ratios (OR) for reporting more frequent restless sleep by frequency of SHS exposure among a sample of adolescents (𝑁=1,466).

Overall SHS exposure in the past month (versus never)^c	Restless sleep^a
	Unadjusted; OR (95% CI)	Full model^b; OR (95% CI)
Never (reference)	—	—
At least once in the past month (low)	1.69^†† (1.19–2.40)	1.53* (1.08–2.16)
At least once a week (medium)	2.01^†† (1.39–2.89)	1.76^† (1.22–2.53)
Every day or almost every day (high)	3.05^†† (2.00–4.67)	2.51^†† (1.59–3.98)

CI: confidence interval.
^aOrdered categories for increasing amounts of restless sleep are rarely or none of the time (<1 day per week), some or a little of the time (1-2 days per week), occasionally or a moderate amount of the time (3-4 days per week), and most or all of the time (5–7 days per week).
^bAdjusted for age, gender, ethnicity, subjective family income, and smoking status (smoked in the past 30 days).
^cNever was used as reference group.
Based on the test of parallel lines, the proportional odds assumption was held for all models.
* 𝑃<0.05; ^†𝑃<0.01; ^††𝑃≤0.001.