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ess1 under Sleep Questionnaires/Hypersomnia/Epworth Sleepiness Scale (ESS) in BESTAIR variables
sitread under Sleep Questionnaires/Hypersomnia/Epworth Sleepiness Scale (ESS) in CCSHS variables
sitread under Sleep Questionnaires/Hypersomnia/Epworth Sleepiness Scale (ESS)/Interim in SHHS variables
sitrd02 under Sleep Questionnaires/Hypersomnia/Epworth Sleepiness Scale (ESS)/SHHS1 in SHHS variables
sh319a under Sleep Questionnaires/Hypersomnia/Epworth Sleepiness Scale (ESS)/SHHS2 in SHHS variables