The Filipino Adaptation of the Glaucoma Medication Adherence Self-Efficacy Questionnaire

Abstract

Objectives: This study translated the Glaucoma Medication Adherence Self-Efficacy Questionnaire (GMASQ) and tested the reliability of Filipino-adapted GMASQ. Methods: A Filipino-adapted GMASQ was developed using the guidelines recommended for translating a validated health-related questionnaire into a culturally-adapted one. The methods included: (1) forward translation, (2) back-translation, (3) review and modification, (4) pre-testing and cognitive interviewing, and (5) final version testing. The provisional questionnaire was pre-tested on 20 glaucoma patients to determine its value and correspondence, generating a final forward questionnaire. The final version was administered to 48 patients. Its reliability was determined by computing for the Cronbach’s α for each item, per section, and overall. An item was removed if the α was 0.8 for all items with a section α = 0.84. The eye-drop technique had an α > 0.7 for each item and a section α = 0.80. Conclusion: This study provided preliminary evidence of the feasibility, acceptance and reliability of the Filipino GMASQ.

Keywords

• glaucoma
• medication adherence
• self-efficacy
• questionnaire
• translation