Dataset Variable No Yes Don't Know/Not sure/Not applicable
HEARTBEAT Work rotating night shifts - Baseline visit 289 21 -
HEARTBEAT Work steady night shifts - Baseline visit 290 19 -
CFS Do you do rotating night shift work? - Visit 5 632 56 -
CFS Do you do steady night shift work? - Visit 5 628 59 -
Total 1839 155 -