Reliability and Validity of the Turkish Version of the Deglutition Handicap Index

The Deglutition Handicap Index (DHI) is a self-reported questionnaire focus on dysphagia related quality of life of patients. The present study was aimed to translate the DHI into Turkish, and investigate the reliability and validity of the Turkish version of the DHI (T-DHI). A total of 100 patients with different diagnoses participated. The study was carried out in 3 phases including translation, reliability and validation phases. The translation phase was performed by the forward-backward-forward translation methodology. The internal consistency and test-retest reliability were used for reliability phase. The criterion validity of the T-DHI was investigated for validation phase. The Cronbach's alpha value of the T-DHI was 0.93 of which indicates excellent internal consistency. The Intraclass Correlation Coefficient ranged from 0.96 to 0.99 for test-retest reliability. There was negative and weak correlation between functional subscale score from the T-DHI and the Functional Oral Intake Scale (r=-0.29, p = 0.004), and positive and moderate to strong correlations between total and subscale scores from the T-DHI and the Turkish version of the Eating Assessment Tool (r = 0.67-0.78, p < 0.001) indicating sufficient criterion validity. The T-DHI is a reliable and valid questionnaire to define dysphagia related quality of life of patients. Clinicians could be used the T-DHI during swallowing evaluation part during the management process of deglutition disorders to plan patient centered rehabilitation, improve care and follow up.