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. Author manuscript; available in PMC: 2023 Feb 1.
Published in final edited form as: Sleep Health. 2021 Oct 4;8(1):47–53. doi: 10.1016/j.sleh.2021.08.006

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