Medication literacy in Spanish and English: Psychometric evaluation of a new assessment tool
Journal of the American Pharmacists Association
Objective: To evaluate the psychometric properties of a newly developed Medication Literacy Assessment in Spanish and English (MedLitRxSE). Design: Descriptive, nonexperimental, cross-sectional study. Setting: El Paso, TX, from December 2006 to June 2009. Participants: 181 English- or Spanish-speaking adults. Intervention: Survey administered in two phases. Main outcome measures: Descriptive statistics, internal consistency, confirmatory factor analysis (CFA) and fit indices, and criterion-related validity. Results: The 20-item MedLitRxSE tool showed adequate internal consistency and reliability, and CFA revealed overall good model fit. In phase 2, the shorter 14-item MedLitRxSE showed good total test reliability and correlated well with the Short Test of Functional Health Literacy in Adults. Item response theory analyses showed no language bias and a one-dimensional (i.e., one factor) model of medication literacy. Conclusion: The initial and latest shorter version of the MedLitRxSE tool demonstrated good psychometric properties. This tool may provide a new option to assess "medication literacy" in English and Spanish.