The HIV Medication Taking Self-efficacy Scale: psychometric evaluation
Article first published online: 16 AUG 2010
© 2010 The Authors. Journal of Advanced Nursing © 2010 Blackwell Publishing Ltd
Journal of Advanced Nursing
Volume 66, Issue 11, pages 2560–2572, November 2010
How to Cite
Erlen, J. A., Cha, E. S., Kim, K. H., Caruthers, D. and Sereika, S. M. (2010), The HIV Medication Taking Self-efficacy Scale: psychometric evaluation. Journal of Advanced Nursing, 66: 2560–2572. doi: 10.1111/j.1365-2648.2010.05400.x
- Issue published online: 7 OCT 2010
- Article first published online: 16 AUG 2010
- Accepted for publication 22 May 2010
- antiretroviral therapy;
- HIV Medication Taking Self-Efficacy Scale;
- psychometric evaluation instrument development;
erlen j.a., cha e.s., kim k.h., caruthers d. & sereika s.m. (2010) The HIV Medication Taking Self-efficacy Scale: psychometric evaluation. Journal of Advanced Nursing 66(11), 2560–2572.
Aim. This paper is a report of an examination of the psychometric properties of the HIV Medication Taking Self-efficacy Scale.
Background. Self-efficacy is a critically important component of strategies to improve HIV medication-taking; however, valid and reliable tools for assessing HIV medication-taking self-efficacy are limited.
Method. We used a cross-sectional, correlational design. Between 2003 and 2007, 326 participants were recruited from sites in Pennsylvania and Ohio in the United States of America. Six self-report questionnaires administered at baseline and 12 weeks later during ‘Improving Adherence to Antiretroviral Therapy’ were used to examine the variables of interest. Means and variances, reliability, criterion, and construct validity of the HIV Medication Taking Self-efficacy Scale were assessed.
Findings. Participants reported high self-confidence in their ability to carry out specific medication-related tasks (mean = 8·31) and in the medication’s ability to effect good outcomes (mean = 8·56). The HIV Medication Taking Self-efficacy Scale and subscales showed excellent reliability (α = 0·93∼0·94). Criterion validity was well-established by examining the relationships between the HIV Medication Taking Self-efficacy Scale and selected physiological and psychological factors, and self-reported medication adherence (r = −0·20∼0·58). A two-factor model with a correlation between self-efficacy belief and outcome expectancy fitted the data well (model χ2 = 3871·95, d.f. = 325, P < 001; CFA = 0·96; RMSEA = 0·046).
Conclusion. The HIV Medication Taking Self-efficacy Scale is a psychometrically sound measure of medication-taking self-efficacy for use by researchers and clinicians with people with HIV. The findings offer insight into the development of interventions to promote self-efficacy and medication adherence in persons with HIV.