Psychometric properties of the Chinese Parent Version of the Autism Spectrum Rating Scale: Rasch analysis

Abstract

The Autism Spectrum Rating Scale is a behavioural rating scale completed by parents and teachers that is useful for identifying children with an autism spectrum disorder. The development of a modified Autism Spectrum Rating Scale suitable for use in China is important for the identification of children in China with an autism spectrum disorder. In this study, we examined the Modified Chinese Autism Spectrum Rating Scale using a statistical technique known as Rasch analysis. Rasch analysis tests whether the questionnaire meets the standards for modern scientific measurement. We used Rasch analysis to examine data from 2013 children in China including 420 diagnosed with an autism spectrum disorder who had been rated by a parent or grandparent. After removing a small number of items (questions), the Modified Chinese Autism Spectrum Rating Scale met the stringent criteria for Rasch measurement. The availability of a reliable and precise tool for assessing behaviours characteristic of an autism spectrum disorder in Chinese children will improve the identification and diagnosis of autism spectrum disorder in China, thus enabling better provision of support services.

Trial registration: ClinicalTrials.gov NCT02200679.

Keywords: Autism Spectrum Rating Scale; China; Rasch analysis; autism spectrum disorders; parent version; psychometrics; school-age children.

Figures

Figure 1.

Examination of item 1 for differential item function by sex.

Figure 2.

Person-item threshold distribution for 13-item Social Communication subscale (n = 2013).

Figure 3.

Person-item threshold distribution for 12-item Self-Regulation subscale (n = 2013).

Figure 4.

Person-item threshold distribution for 13-item Unusual Behaviour subscale (n = 2013).

Figure 5.

Person-item threshold distribution for 59-item ASRS (n = 1999).