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sawa108
under
Sleep Monitoring/Actigraphy
in
HCHS variables
Sleep efficiency is the proportion of sleep duration (i.e. total sleep time, tst) in total rest period (i.e. rest interval) in main sleep. Sleep duration is the interval between sleep onset time and sleep offset time while asleep. In this study, rest interval is the same as in-bed period.
sawa111
under
Sleep Monitoring/Actigraphy
in
HCHS variables
Sleep Fragmentation is an index of restlessness during the sleep period expressed as a percentage. Kristen L et al. 2011 (PubMed ID:21411507) There are three type of measures for sleep fragmentation: movement Index (MI), fragmentation index (FI), and total sleep fragmentation Index. The fragmentation index refers to the percentage of 60s periods of sleep out of the total number of periods of immobility. The movement index refers to the total of scored awake minutes divided by sleep period (i.e. total time in bed). The total sleep fragmentation index is the sum of FI and MI. (ActiGraph validation reference)[https://actigraphcorp.force.com/support/s/article/Sleep-Fragmentation-Index-Validation-Reference]
sawa148
under
Sleep Monitoring/Actigraphy
in
HCHS variables
Sleep duration (i.e. total sleep time) is the interval between sleep onset and sleep offset time while asleep. This variable is similar to sawa35; however, sawa35 is calculated based on data generated by Actiware software before data cleaning and imputation.