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53,921 items of data are available, covering 34,401 participants, encoded using Data-Coding 489. Array indices run from 0 to 32.
Participants were asked: "Which shift pattern(s) did you follow for this job?" Participants who indicated they worked a mixture of day and night shifts were then asked: "Did you work a mixture of day and night shifts for the whole of this job?"
Day-shifts were defined as work in nomal daytime hours or morning, afternoon or evening work.
Night-shifts were defined as work for at least 3 hours between midnight and 5am.