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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