Validation of the Chinese non-pharmacological therapy experience scale in persons with intellectual disability

Abstract

Aim: To validate the 4- and 7-point Chinese Non-pharmacological Therapy Experience Scales and test the psychometric properties of the scales on persons with intellectual disability. Design: A validation study. Methods: Sixty-seven persons with intellectual disability were recruited from six hostels or centres for persons with intellectual disability in Hong Kong. A total of 1,163 and 1,161 observations were collected by the trained observers with the 4-point and 7-point scales, respectively. The floor and ceiling effects, inter-rater reliability, internal consistency, responsiveness of both scales and the scale equivalence were examined. Results: The Cronbach's alpha of the 4- and 7-point scales was .762 and .797, respectively. The correlation between the two scales was 0.906. The inter-rater reliability of the 4- and 7-point scales was 0.774 and 0.835, respectively. Neither scale had the floor or ceiling effects. The effect size of the 7-point scale was consistently higher than that of the 4-point scale.