Journal
AMERICAN JOURNAL OF GASTROENTEROLOGY
Volume 102, Issue 7, Pages 1417-1426Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1111/j.1572-0241.2007.01212.x
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BACKGROUND This study reports cross-sectional medication adherence data from year 1 of the Manitoba AND AIMS: Inflammatory Bowel Disease (IBD) Cohort Study, a longitudinal, population-based study of multiple determinants of health outcomes in IBD in those diagnosed within 7 yr. METHODS: A total of 326 participants completed a validated multi-item self-report measure of adherence, which assesses a range of adherence behaviors. Demographic, clinical, and psycho-social characteristics were also assessed by survey. Adherence was initially considered as a continuous variable and then categorized as high or low adherence for logistic regression analysis to determine predictors of adherence behavior. RESULTS: Using the cutoff score of 20/ 25 on the Medication Adherence Report Scale, high adherence was reported by 73% of men and 63% of women. For men, predictors of low adherence included diagnosis (UC: OR 4.42, 95% CI 1.66 - 11.75) and employment status (employed: OR 11.27, 95% CI 2.05 - 62.08). For women, predictors of low adherence included younger age ( under 30 versus over 50 OR 3.64, 95% CI 1.41 - 9.43; under 30 vs. 40 - 49 yr: OR 2.62, 95% CI 1.07 - 6.42). High scores on the Obstacles to Medication Use Scale strongly related to low adherence for both men ( OR 4.05, 95% CI 1.40 - 11.70) and women ( OR 3.89, 95% CI 1.90 - 7.99). 5- ASA use (oral or rectal) was not related to adherence. For women, immunosuppressant use versus no use was associated with high adherence (OR 4.49, 95% CI 1.58 - 12.76). Low trait agreeableness was associated with low adherence ( OR 2.03, 95% CI 1.12 - 3.66). CONCLUSIONS: Approximately one-third of IBD patients were low adherers. Predictors of adherence differed markedly between genders, although obstacles such as medication cost were relevant for both men and women.
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