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Table 3 General characteristics of the female workers

From: Comparison of sleep quality based on direction of shift rotation in electronics workers

  Total Forward rotation Backward rotation P value*
Number of participants 3001 2879 (95.9) 122 (4.1)  
Age, years 27.0 ± 4.3 27.0 ± 4.3 27.0 ± 4.1 0.870
BMI, kg/m2 22.1 ± 4.1 22.1 ± 4.1 21.7 ± 3.4 0.357
Duration of shift work     0.034
 <5 years 736 694 (94.3) 42 (5.7)  
 5–9 years 1324 1277 (96.5) 47 (3.5)  
 ≥10 years 941 908 (96.5) 33 (3.5)  
Weekly working hours     0.051
 <41 h 597 565 (94.6) 32 (5.4)  
 41–51 h 2168 2093 (96.5) 75 (3.5)  
 52–59 h 205 192 (93.7) 13 (6.3)  
 ≥60 h 31 29 (93.5) 2 (6.5)  
Smoking status     0.900
 Non-smoker 2703 2592 (95.9) 111 (4.1)  
 Ex-smoker 293 282 (96.2) 11 (3.8)  
 Current smoker 5 5 (100.0) 0 (0.0)  
Alcohol consumption     0.497
 Non-drinker 1512 1457 (96.4) 55 (3.6)  
 Regular drinker 1199 1145 (95.5) 54 (4.5)  
 Heavy drinker 290 277 (95.5) 13 (4.5)  
Physical activity     0.592
 Sufficient exercise 742 709 (95.6) 33 (4.4)  
 Insufficient exercise 2259 2170 (96.1) 89 (3.9)  
Sleep duration, hours 7.1 ± 1.6 7.2 ± 1.6 6.8 ± 1.5 0.037
PSQI score, points 4.6 ± 2.8 4.5 ± 2.7 5.6 ± 2.8 <0.001
  1. Values are number (%) or mean ± Standard Deviation (SD), unless otherwise indicated
  2. P value* = Chi-square test or Mann-Whitney test