To explore the feasibility of applying the Malocclusion Impact Questionnaire (MIQ) of Chinese version among Chinese teenagers, through the verification and evaluation of the Chinese version.

According to the standard procedures of the international quality of life assessment program, the MIQ was translated, back translated, adapted and updated culturally, and the Chinese version was established. The 161 teenagers with the first orthodontic treatment were included. This patient group was assessed for oral health-related quality of life by the Chinese version of the MIQ and Children's Perception Questionnaire (11-14 years old). The reliability and validity of the Chinese version of the MIQ were evaluated statistically by Spearman and factor analysis.

A total of 161 valid questionnaires were collected. The internal consistency Cronbach's α of the Chinese scale was 0.887. The correlation coefficient between items and the scale ranged from 0.0001 to 0.824. A significant positive correlation of the scores was noted between the translated scale and the Children's Perception Questionnaire (11-14 years old), and the correlation coefficient was 0.444 (P<0.001).

The reliability and validity of the Chinese version of the MIQ are reliable and can be applied for clinical orthodontic treatment.