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Table 2 Variables and risk factors for temporomandibular disorders (TMD)

From: Temporomandibular disorders among medical students in China: prevalence, biological and psychological risk factors

Biological factor r p value Static occlusion r p value Psychological factor r p value
Age 0.050 0.172 Angle’s malocclusion − 0.061 0.320 Depression 0.231 < 0.001
Gender 0.044 0.222 Anterior teeth overbite 0.166 < 0.001 Anxiety 0.355 < 0.001
Sleep bruxism 0.164 < 0.001 Anterior teeth overjet 0.110 0.002 Sleep disturbance 0.184 < 0.001
Awake bruxism 0.099 0.006 Posterior teeth crossbite − 0.041 0.260    
Empty chewing 0.192 < 0.001 Posterior scissor bite 0.055 0.135    
Unilateral chewing 0.219 < 0.001       
Chewing gum 0.079 0.030