The reliability and validity of the Chinese version of swallowing quality of life questionnaire / 中华物理医学与康复杂志

ABSTRACT

Objective To develop the quality of life questionnaire applicable to the Chinese patients with dysphagia by the translation and modification,as well as psychometric evaluation of the original swallowing quality of life questionnaire (SWAL-QOL).Methods The English version of the SWAL-QOL was translated into Chinese according to the well-accepted scale translation procedure.Then 103 patients with dysphagia were tested using the translated Chinese SWAL-QOL.The inter-rater reliability,test-retest reliability,internal consistency reliability,the content validity and construct validity were tested.Results The inter-rater reliability correlation coefficient of the SWAL-QOL was between 0.945-0.990 (P＜0.01).Its test-retest coefficients ranged from 0.965 to 0.992 (P＜0.01).The Cronbach coefficients ranged from 0.708 to 0.933 (P＜0.01).There revealed significant correlation between each item of SWAL-QOL and its domain,with correlation coefficients between 0.723 and 0.982 (P＜0.01).Factor analysis of each item of the 10 domains of SWAL-QOL extracted 10 common factors,which were with a cumulative contribution of 79.029％.Factor analysis of the total score of the 10 dimensions extracted 2 common factors including dysphagia-related quality of life and general quality of life,with a cumulative contribution of 54.718％.Conclusions The Chinese version of SWAL-QOL is reliable and valid.It can be used as an effective measuring tool to evaluate the quality of life of dysphagia patients.