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Abstract #76368 Published in IGR 19-3
Psychometric Properties of the Glaucoma Treatment Compliance Assessment Tool (GTCAT) in a Brazilian Population
Abe RY; Wen LC; Barker GT; Mansberger SLJournal of Glaucoma 2018; 27: 257-265
PURPOSE: To determine the psychometric properties of a reduced version of the Glaucoma Treatment Compliance Assessment Tool (GTCAT), which was translated to Brazilian Portuguese. PATIENTS AND METHODS: We translated into Portuguese the GTCAT using validated techniques and administered it to a group of glaucoma patients using at least 1 ocular hypotensive eye drop medication. We used principal components analysis to determine construct validity, Rasch analysis, and Cronbach α for internal consistency reliability, frequency analysis for floor and ceiling effects, and Spearman ρ for test-retest reliability. RESULTS: We included 76 glaucoma patients. Principal component analysis loaded 14 questions into 7 components that were consistent with the Health Belief Model. The components were related to "barriers due to lack of drops," "self-efficacy," "experience of negative effects of the disease," "well-being," "general glaucoma knowledge," "glaucoma symptoms," and "cues-to-action." No statements had floor or ceiling effects, and all statements had acceptable test-retest reliability. Components had internal consistency Cronbach α reliability between 0.125 and 0.794. and average Spearman ρ reliability was 0.73, ranging from 0.44 to 1.00. According to Rasch analysis, the mean (±SD) of the person measures was 0.24±0.15 logits, person separation index was 0.58, and person reliability 0.25. CONCLUSIONS: The Portuguese-translated version of the GTCAT showed acceptable psychometric properties. With further refinement, clinicians and researchers could use it to better investigate glaucoma adherence issues in the Brazilian population.
Hospital Oftalmológico de Brasília, Brasília, Distrito Federal, Brazil.
Full articleClassification:
11.17 Cooperation with medical therapy e.g. persistency, compliance, adherence (Part of: 11 Medical treatment)
