Development of the 8-Item Phlegm Pattern Questionnaire (PPQ-8) Using Rasch Analysis
The 25-item Phlegm Pattern Questionnaire (PPQ) has been widely used to examine the relationship between the phlegm pattern (PP), quality of life, tongue colour, vocal qualities, and dysfunctional breathing. However, the concerns of response burden and differences in the respondent's abilities or item difficulty for the original version of the PPQ have not been sufficiently addressed. This study aimed to develop a short-form PPQ using Rasch analysis, an item response theory. Based on the retrospective data, the response order, differential item functioning (DIF), dimensionality, reliability, concurrent validity, and fitting errors were examined for 291 normal participants and 61 inpatients. The discriminative ability of the short-form PPQ was examined using receiver operating characteristic curve analysis. Along with Rasch analysis, another short-form PPQ was developed using equidiscrimin...
Young-Jae Park (2021). Development of the 8-Item Phlegm Pattern Questionnaire (PPQ-8) Using Rasch Analysis. Evidence-based Complementary and Alternative Medicine, 2021, 1-10. https://doi.org/10.1155/2021/6528891