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Table 2 The prevalence of temporomandibular disorders (TMD) according to work-related factors

From: The associations between work-related factors and temporomandibular disorders among female full-time employees: findings from the Fourth Korea National Health and Nutrition Examination Survey IV (2007–2009)

  Prevalence of TMD
No N(%) Yes N(%) P valuea
Total 1,405 207  
Occupation
 Manual 445(93.6) 32(6.4) <  0.001
 Non-manual 960(84.4) 175(15.6)
Working schedule
 Daytime 1,208(86.7) 180(13.3) 0.600
 Shift work 197(88.2) 27(11.9)
Employment status
 Regular 1,009(86.2) 155(13.8) 0.198
 Temporary 396(88.8) 52(11.2)
Working hours (hrs/wk)
  < 40 244(92.0) 25(8.0) 0.011
 40–48 752(87.4) 107(12.6)
 49–60 283(84.8) 48(15.2)
  > 60 126(80.2) 27(19.8)
  1. aχ2 test