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Table 2 Crude, semi-adjusted, and fully adjusted models for shift schedule types and sickness absence outcomes

From: Cumulative exposure to shift work and sickness absence: associations in a five-year historic cohort

 

Crude model

Semi-adjusted model

Fully adjusted model

Long-term sickness absence (>7 days)

OR (95% CI)

OR (95% CI)

OR (95% CI)

 Shift schedule type 2005–2008

Day work

Reference

Reference

Reference

Three-shift schedule

1.88 (1.63–2.17)

1.43 (1.22–1.69)

1.13 (0.94–1.35)

Two-shift schedule

1.76 (1.50–2.06)

1.40 (1.17–1.68)

1.08 (0.89–1.31)

Transfer out of three-shift

1.23 (0.97–1.54)

1.06 (0.82–1.37)

0.90 (0.69–1.17)

Transfer into three-shift

2.49 (2.03–3.06)

1.84 (1.46–2.32)

1.31 (1.02–1.69)

Other kind of transfer

1.59 (1.30–1.94)

1.33 (1.06–1.67)

1.06 (0.84–1.35)

 Sickness absence days 2005–2008

≥0 to <26 days

 

Reference

Reference

≥26 to <67 days

 

3.06 (2.58–3.62)

2.99 (2.52–3.55)

≥67 to <140 days

 

8.10 (6.80–9.66)

7.45 (6.23–8.90)

≥140 days

 

12.53 (10.48–14.99)

11.28 (9.40–13.53)

 Special operational requirements

   

1.00 (0.99–1.02)

 Knowledge requirements

  

0.98 (0.97–0.98)

 Aggravated working conditions

≤4

 

Reference

>4 to ≤11

 

1.14 (0.94–1.37)

>11 to ≤15

 

1.14 (0.92–1.40)

>15

 

1.21 (0.94–1.55)

Sickness absence episodes

IRR (95% CI)

IRR (95% CI)

IRR (95% CI)

 Shift schedule type 2005–2008

Day work

Reference

Reference

Reference

Three-shift schedule

0.95 (0.89–1.01)

0.82 (0.77–0.87)

0.82 (0.76–0.88)

Two-shift schedule

0.95 (0.89–1.02)

0.84 (0.78–0.90)

0.83 (0.77–0.90)

Transfer out of three-shift

0.93 (0.84–1.02)

0.83 (0.75–0.91)

0.83 (0.75–0.92)

Transfer into three-shift

1.05 (0.96–1.14)

0.87 (0.79–0.94)

0.89 (0.81–0.98)

Other kind of transfer

0.97 (0.89–1.06)

0.82 (0.75–0.89)

0.83 (0.76–0.91)

 Sickness Absence days 2005–2008

≥0 to <26 days

 

Reference

Reference

≥26 to <67 days

 

2.20 (2.06–2.35)

2.22 (2.08–2.37)

≥67 to <140 days

 

3.18 (2.97–3.40)

3.22 (3.01–3.44)

≥140 days

 

3.51 (3.28–3.75)

3.57 (3.34–3.82)

 Special operational requirements

   

1.01 (1.00–1.02)

 Knowledge requirements

  

1.00 (1.00–1.00)

 Aggravated working conditions

≤4

 

Reference

>4 to ≤11

 

1.03 (0.96–1.10)

>11 to ≤15

 

1.03 (0.95–1.12)

>15

 

0.86 (0.78–0.94)

  1. Semi-adjusted model adjusted for age, gender, marital status, having children, commuting distance, employment duration, mean contract percentage, working overtime, and previous sickness absence days. Job classification variables special operational requirements, knowledge requirements, and aggravated working conditions were added to the fully adjusted model
  2. Bold: P < 0.05