Rasch Analysis of the Adult Strabismus Quality of Life Questionnaire AS-20 among Chinese Adult Patients with StrabismusReport as inadecuate




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Background

The impact of strabismus on visual function, self-image, self-esteem, and social interactions decrease health-related quality of life HRQoL.The purpose of this study was to evaluate and refine the adult strabismus quality of life questionnaire AS-20 by using Rasch analysis among Chinese adult patients with strabismus.

Methods

We evaluated the fitness of the AS-20 with Rasch model in Chinese population by assessing unidimensionality, infit and outfit, person and item separation index and reliability, response ordering, targeting and differential item functioning DIF.

Results

The overall AS-20 did not demonstrate unidimensional; however, it was achieved separately in the two Rasch-revised subscales: the psychosocial subscale 11 items and the function subscale 9 items. The features of good targeting, optimal item infit and outfit, and no notable local dependence were found for each of the subscales. The rating scale was appropriate for the psychosocial subscale but a reduction to four response categories was required for the function subscale. No significant DIF were revealed for any demographic and clinical factors e.g., age, gender, and strabismus types.

Conclusion

The AS-20 was demonstrated by Rasch analysis to be a rigorous instrument for measuring health-related quality of life in Chinese strabismus patents if some revisions were made regarding the subscale construct and response options.



Author: Zonghua Wang, Juan Zhou, Xingli Luo, Yan Xu, Xi She, Ling Chen, Honghua Yin, Xianyuan Wang

Source: http://plos.srce.hr/



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