Table 6: Questionnaire Items and Factor Loading of Factor Analysis on the E-group

Questionnaire Item Factor
1st 2nd 3rd
Psychosocial factors Q5 Stress level 0.919 0.012 -0.134
Q6 Feeling of anxiety 0.912 0.033 -0.113
Q7 Depressed mood 0.736 -0.073 0.186
Q8 Chronic fatigue 0.490 0.045 0.215
TRS Q2 Mouth-opening pain -0.055 0.731 0.000
Q1 Limited mouth opening -0.009 0.581 -0.079
Q3 Mouth-opening deviation 0.045 0.554 -0.034
Q4 Chewing-induced pain 0.038 0.471 0.017
Habitual behavior factors Q10 Morning symptoms 0.026 0.232 0.344
Q9 TCH -0.017 -0.072 0.338
Proportion of variance (%) 28.9 12.3 1.8

TRS: TMD-related symptoms, TCH: tooth contacting habit
Based on the results, we identified three latent variables; (1) Psychological factor, (2) Symptoms of TMD, and (3) Habitual behavioral factors.