Tran Van D, Dorofeeva Valeria V, Loskutova Ekaterina E
Department of Pharmaceutical Management and Economics, Peoples' Friendship University of Russia (RUDN University). Moscow (Russia).
Pharm Pract (Granada). 2018 Oct-Dec;16(4):1327. doi: 10.18549/PharmPract.2018.04.1327. Epub 2018 Dec 13.
The purpose of this study is to develop and validate the psychometric properties of a scale for measuring the quality of patient medication counseling by using the Rasch model.
In this study, the scale was developed based on the literature review. It consisted of 31 items across five subscales: introduction, problem identification, content, behavior, and conclusion. A convenient sample of community pharmacists was recruited from four major cities in Vietnam: Hanoi, Da Nang, Ho Chi Minh, and Can Tho. Data collection was conducted from June 10 to October 30, 2017. A Rasch analysis for polytomous data was performed to assess the suitability of the item and the reliability of the scale.
The research results showed that all items had a positive point-measure correlation coefficient between 0.47 and 0.77. All items had infit and outfit values in the optimal range between 0.5 and 1.5 except for D, but its value was within acceptable range. Differential item function analysis indicated that all items had no DIF, except for items B and E containing moderate magnitude of DIF. Response category statistics found that there was a gradual increase in difficulty level from category 1 to 5 and no presence of reversal. Infit and outfit statistics of these categories were also considered good, with their values close to 1. The test result of the item characteristic curve and the person-item map showed that there were some overlapping items. Their appearance, however, might play an important role in measuring different aspects of construct. The overall scale reliability index (0.97) was high and the overall scale separation index (6.11) was good.
The developed scale satisfied the requirements of the Rasch model. The scale is a useful tool that could be used to measure the quality of patient medication counseling among community pharmacists.
本研究旨在开发并验证一个使用拉施模型来测量患者用药咨询质量的量表的心理测量特性。
在本研究中，该量表基于文献综述进行开发。它由31个项目组成，分为五个子量表：引言、问题识别、内容、行为和结论。从越南的四个主要城市：河内、岘港、胡志明市和芹苴招募了一个便利样本的社区药剂师。数据收集于2017年6月10日至10月30日进行。对多分类数据进行拉施分析，以评估项目的适用性和量表的可靠性。
研究结果表明，所有项目的点测量相关系数均为正，介于0.47和0.77之间。除项目D外，所有项目的内拟合和外拟合值均在0.5至1.5的最佳范围内，但其值在可接受范围内。差异项目功能分析表明，除项目B和E存在中等程度的差异项目功能外，所有项目均无差异项目功能。反应类别统计发现，从类别1到5难度水平逐渐增加，且不存在反转。这些类别的内拟合和外拟合统计也被认为良好，其值接近1。项目特征曲线和人项目图的测试结果表明存在一些重叠项目。然而，它们的出现可能在测量结构的不同方面发挥重要作用。整体量表可靠性指数（0.97）较高，整体量表区分指数（6.11）良好。
所开发的量表满足拉施模型的要求。该量表是一个有用的工具，可用于测量社区药剂师对患者用药咨询的质量。
