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.
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 glaucomapatients 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 glaucomapatients. 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.
Authors: Yu Heng Kwan; Livia Jia Yi Oo; Dionne Hui Fang Loh; Truls Østbye; Lian Leng Low; Hayden Barry Bosworth; Julian Thumboo; Jie Kie Phang; Si Dun Weng; Dan V Blalock; Eng Hui Chew; Kai Zhen Yap; Corrinne Yong Koon Tan; Sungwon Yoon; Warren Fong Journal: J Med Internet Res Date: 2020-10-08 Impact factor: 5.428
Authors: Yu Heng Kwan; Si Dun Weng; Dionne Hui Fang Loh; Truls Østbye; Lian Leng Low; Hayden Barry Bosworth; Julian Thumboo; Jie Kie Phang; Livia Jia Yi Oo; Dan V Blalock; Eng Hui Chew; Kai Zhen Yap; Corrinne Yong Koon Tan; Sungwon Yoon; Warren Fong Journal: J Med Internet Res Date: 2020-10-09 Impact factor: 5.428
Authors: Ricardo Y Abe; Heloísa A Maestrini; Guilherme B Guedes; Marcelo M Nascimento; Camila I Iguma; Hérika Danielle de Miranda Santos; Muna Georges Nasr; Ricarte P Lucena-Junior; Tiago S Prata Journal: Sci Rep Date: 2022-02-04 Impact factor: 4.379