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Table 1 The prevalence of temporomandibular disorders (TMD) according to general characteristics of study population

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(87.2) 207(12.8)  
Age (years)
 20–39 647(81.6) 144(18.4) <  0.001
 40–54 579(92.7) 47(7.3)
 55–64 179(94.1) 16(5.9)
Household income
 1Q(High) 485(85.4) 79(14.6) 0.526
 2Q 426(88.0) 58(12.0)
 3Q 360(88.4) 46(11.6)
 4Q(Low) 134(85.1) 24(14.9)
Educational status
  ≤ Primary school 219(92.9) 20(7.1) <  0.001
 Middle school 161(92.8) 12(7.2)
 High school 506(87.9) 70(12.1)
  ≥ College 519(82.6) 105(17.4)
Marital status
 No 303(78.9) 83(21.1) <  0.001
 Yes 1,102(90.4) 124(9.6)
Problem drinking
 No 1,329(87.8) 183(12.2) 0.001
 Yes 76(74.9) 24(25.1)
Smoking
 Non-smoking 1,260(87.8) 172(12.2) 0.057
 Ex-smoker 53(79.6) 15(20.4)
 Current smoking 92(82.2) 20(17.8)
Exercise
 No 1,219(87.7) 166(12.3) 0.036
 Yes 186(81.7) 41(18.3)
Sleep duration
  ≤ 6 h 565(85.3) 92(14.7) 0.159
  > 6 h 840(88.1) 115(11.9)
Obesity
 Under weight 80(81.0) 21(19.0) 0.172
 Normal 1,009(87.0) 143(13.0)
 Over weight 316(88.5) 43(11.5)
Rheumatoid arthritis
 No 1,391(86.9) 206(13.1) 0.715
 Yes 14(90.7) 1(9.3)
Osteoarthritis
 No 1,296(86.9) 191(13.1) 1.000
 Yes 109(86.9) 16(13.1)
Stress
 Low 941(90.1) 108(9.9) <  0.001
 High 464(81.1) 99(18.9)
Self-rated health
 Excellent/good 639(87.6) 94(12.4) 0.520
 Fair/bad 766(86.4) 113(13.6)
Depressive symptoms
 No 1,193(87.2) 172(12.8) 0.389
 Yes 212(85.0) 35(15.0)
  1. aχ2 test