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Table 1 Sleep, health, and job outcomes for groups of nuclear power plant operators that perceive good or poor adaptation to shift work [57]

From: Prioritizing sleep for healthy work schedules

  Perceived adaptation  
  Good (n = 250) Poor (n = 358) P a
  Mean (SD) Mean (SD)  
Fit to job content (%) 80.3 (13.0) 59.4 (19.6) < 0.001
Eveningness (currently) 3.7 (1.0) 3.2 (1.1) < 0.001
Social and family disruption 16.1 (6.4) 20.0 (5.6) < 0.001
Chronic fatigue 89.5 (21.9) 103.7 (20.9) < 0.001
Shift system advantages 5.4 (2.1) 5.0 (1.7) 0.023
Shift work locus of control 107.2 (15.2) 99.1 (16.1) < 0.001
Psychological wellbeing (GHQ-12) 11.6 (3.5) 13.6 (4.2) < 0.001
Daytime sleepiness (ESS) 6.7 (2.8) 7.1 (2.9) 0.033
Sleep disturbance      
   Day shift 1 20.8 (6.2) 22.3 (6.0) 0.002
   Day shift 2 20.8 (5.9) 22.2 (5.7) 0.005
   Afternoon shift 17.6 (5.9) 19.3 (5.9) 0.007
   Night shift 1      
between afternoon shift and night shift 1 (night) 17.8 (6.2) 19.5 (6.1) 0.004
Before night shift 1 (daytime) 22.8 (7.5) 27.7 (6.8) < 0.001
   Night shift 2      
between night shift 1 and night shift 2 (daytime) 22.7 (7.2) 26.3 (7.4) < 0.001
after night shift 2 (daytime) 22.0 (6.3) 24.9 (6.7) < 0.001
on the first day off (night) 16.7 (6.3) 18.8 (6.3) 0.001
Napping during night shifts (hours)      
   Night shift 1 1.5 (0.9) 1.3 (0.9) 0.001
   Night shift 2 1.8 (1.5) 1.5 (1.3) 0.001
  1. aAdjusted for age. Fit to job content was assessed by the question 'How well do you fit the current job content?' on a 0 to 100% scale in 10% units. Higher scores for sleep disturbance indicate more disturbances. ESS: Epworth Sleepiness Scale; GHQ-12: 12-item General Health Questionnaire.