The aim of this study is to investigate the validity, reliability, and responsiveness of the Cognitive Exercise Therapy Approach-Biopsychosocial Questionnaire (BETY-BQ) in individuals with temporomandibular disorder. The following are alternative hypotheses of the study:

• BETY-BQ has significant convergence with the Patient Health Questionnaire-9 measuring depression.
• BETY-BQ has significant convergence with the Patient Health Questionnaire-15 measuring physical symptoms.
• BETY-BQ has significant convergence with the Generalized Anxiety Disorder-7 measuring anxiety.
• BETY-BQ has significant convergence with the Short Form-36 measuring quality of life.
• BETY-BQ has significant convergence with the Craniomandibular Pain and Disability Inventory measuring disability.
• BETY-BQ has significant convergence with the Mandibular Function Impairment Questionnaire measuring function.
• BETY-BQ has significant stability.
• BETY-BQ has significant internal consistency.

Patient Health Questionnaire-9 (Depression), Patient Health Questionnaire-15 (Physical Symptoms), Generalized Anxiety Disorder-7 (Anxiety), Short Form-36 (Quality of Life), Craniomandibular Pain and Disability Inventory (Disability), and Mandibular Function Impairment Questionnaire (Function) will be administered to participants. For reliability analysis, test-retest stability evaluations will be repeated with the same questionnaire on 30 individuals with a 2-week interval. To determine responsiveness, the same questionnaire will be reapplied to the same 30 individuals at 3-month intervals.

Inclusion Criteria:

• Having received a diagnosis of temporomandibular disorder

Exclusion Criteria:

• Experiencing difficulty in cooperating to fill out the questionnaires
• Being unwilling to participate in the study

Patients with temporomandibular disorder