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sawa158
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]
sawa16
under
Sleep Monitoring/Actigraphy
in
HCHS variables
Rest period is the interval between the start and end of the rest interval, used in actigraphy.This variable is similar to sawa50; however, sawa16 is generated by Actiware software before data optimization.
sawa172
under
Sleep Monitoring/Actigraphy
in
HCHS variables
This variable is similar to the generated variable sawa40; however sawa40 is calculated based on data generated by Actiware software before data optimization.
sawa18
under
Sleep Monitoring/Actigraphy
in
HCHS variables
Sleep period is the interval between sleep onset and sleep offset time.This variable is similar to sawa52; however, sawa18 is generated by Actiware software before data optimization.