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Table 1 Details of the six samples based on exposure time windows of 30–180 days at maximum

From: Length of exposure to long working hours and night work and risk of sickness absence: a register-based cohort study

  30 days 60 days 90 days 120 days 150 days 180 days
Number of employees 9226 7859 6448 5689 4961 4268
Person days 2,302,550 2,058,224 1,847,231 1,667,510 1,506,785 1,369,733
  % % % % % %
Women 89.2 89.9 90.6 90.6 90.7 90.9
Day work contract a b 37.8 38.7 39.7 40.2 41.0 41.6
Shift work contract a b 61.7 61.0 59.9 59.5 58.6 58.0
No night shifts during the follow-up 54.9 53.1 53.2 52.7 53.1 53.0
Full timea 92.9 92.3 91.5 91.1 91.1 92.6
Follow-up ending in sickness absence 61.8 64.5 72.2 76.6 77.1 77.5
  mean (sd) mean (sd) mean (sd) mean (sd) mean (sd) mean (sd)
Length of follow-up (days) 279.6 (367.4) 321.9 (383.6) 376.5 (403.6) 413.1 (416.3) 453.7 (431.1) 500.9 (447.3)
Agea 38.3 (12.6) 39.7 (12.5) 41.9 (11.8) 42.9 (11.6) 43.4 (11.4) 43.8 (11.3)
Working hoursc 4.3 (1.3) 4.3 (1.0) 4.3 (0.8) 4.3 (0.8) 4.3 (0.7) 4.3 (0.7)
Night work hoursc 0.3 (0.5) 0.3 (0.5) 0.3 (0.5) 0.3 (0.5) 0.3 (0.5) 0.3 (0.5)
  1. a Measured at the start of the follow-up
  2. b Employees were included based on the most common contract type during their follow-ups. In the first day of the follow-up, small proportion of them had another contract type
  3. c Distribution (overall) of the time-averages for the longest exposure time window of each sample; includes days off. For example, 40 h of work within a seven-day period corresponds to an average of 5.7 h of work per calendar day