Appendix A.
Actigraphy variables included in composites
Sleep Composite | Variable Descriptions |
---|---|
Sleep Duration | Average sleep period (minutes) |
Average duration of time in bed (minutes) | |
Average minutes asleep in bed | |
Sleep Timing | Average time of midsleep (HH:MM in 24-hour time) |
Average time of sleep onset (HH:MM in 24-hour time) | |
Average bedtime (HH:MM in 24-hour time)* | |
Sleep Variability | SD of time of sleep onset |
SD of duration in bed | |
SD of duration of sleep period | |
SD of time of midsleep | |
SD of bedtime* | |
SD of minutes asleep in bed | |
Sleep Activity | Average time (minutes) awake after sleep onset |
SD of average minute to minute activity levels | |
Average number of awakenings (lasting 5 minutes or more) | |
Average duration (minutes) of longest wake episode (after sleep onset) |
Note.
bedtime variable was based on mother report of time in bed on the daily diary