Reliability and Validity of the Chinese Mandarin Version of the Dysphagia Handicap Index

This study aimed to develop the Dysphagia Handicap Index-Chinese Mandarin (DHI-CM) and to assess its reliability and validity. This prospective study was conducted in China with individuals who speak Mandarin. The DHI-CM was developed according to a five-stage process. 264 patients with oropharyngeal dysphagia (OD) and 187 healthy individuals completed the study. Reliability was assessed using Cronbach's alpha and test-retest reliability. Differences between healthy participants and patients with OD were analyzed for instrument validity. Convergent and concurrent validity were assessed using the Swallowing Quality of Life Questionnaire (SWAL-QoL) and Functional Oral Intake Scale (FOIS), respectively. The Content Validity Index (CVI) was used to assess content validity. Exploratory and Confirmatory Factor Analyses (EFA and CFA, respectively) were used to assess structural validity. The Cronbach's alpha was > 0.9 for the total score and every individual subscale. The Pearson and intraclass correlation coefficients were both > 0.8. The patients with OD showed significantly higher scores in the DHI-CM and its subscales than the healthy individuals. Significant correlations were found between most subscales of the DHI-CM and both the SWAL-QoL and FOIS. The CVI of the DHI-CM was 0.892 and ranged between 0.878 and 1.000 for the subscales. The EFA identified three components that explained 24.33%, 23.99%, and 22.73% of the variance, respectively. The scale showed good structural validity through CFA. Conclusions. The DHI-CM demonstrated good reliability and validity among Mandarin-speaking Chinese adults.