|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.
* ; †; ††.