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Abstract #26268 Published in IGR 12-2
Development of an instrument to measure glaucoma medication self-efficacy and outcome expectations
Sleath B; Blalock SJ; Robin A; Hartnett ME; Covert D; DeVellis B; Giangiacomo AEye 2010; 24: 624-631
PURPOSE: The purpose of this study was to develop and evaluate the psychometric properties of (a) a glaucoma medication self-efficacy scale and (b) a glaucoma outcome expectations scale. PATIENTS AND METHODS: Two instruments were developed: a glaucoma medication self-efficacy scale and a glaucoma outcome expectations scale. Packets containing (a) the instruments and patient demographic questions and (b) a letter explaining the study were distributed to 225 glaucoma patients from three ophthalmology practices between August and December 2007. The instrument was completed by 191 patients for a response rate of 85%. Principal components factor analysis with a varimax rotation and Cronbach's alpha reliability were used to analyse the data. To assess discriminant validity, we administered the scales and two self-reported measures of adherence in a separate sample of 43 glaucoma patients who were currently using at least one glaucoma medication. RESULTS: Our results yielded a 21-item self-efficacy in overcoming barriers that might interfere with the use of glaucoma medications scale, a 14-item self-efficacy in carrying out specific tasks required to use eye drops correctly scale, and a four-item glaucoma outcome expectations scale. Results of the Cronbach's alpha reliability indicated that the scales are internally consistent. The self-efficacy scales were both significantly associated with two patient self-reported measures of glaucoma medication adherence, which show discriminant validity. CONCLUSIONS: Eye care providers and researchers can use these scales to identify patients with low self-efficacy in using their glaucoma medications and patients who do not believe that following their eye care providers' advice can help their vision.
Cecil G. Sheps Center for Health Services Research, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7590, USA. betsy_sleath@unc.edu
Classification:
11.17 Cooperation with medical therapy e.g. persistency, compliance, adherence (Part of: 11 Medical treatment)
1.4 Quality of life (Part of: 1 General aspects)
