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Influence of refill adherence method when comparing level of adherence for different dosing regimens
Linköping University, Department of Medical and Health Sciences, Division of Drug Research. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Center for Diagnostics, Department of Clinical Pharmacology.
University of Gothenburg, Sweden .
Nordic Health Econ AB, Sweden .
University of Gothenburg, Sweden Nordic School Public Heatlh, Sweden .
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2014 (English)In: European Journal of Clinical Pharmacology, ISSN 0031-6970, E-ISSN 1432-1041, Vol. 70, no 5, 589-597 p.Article in journal (Refereed) Published
Abstract [en]

To examine the impact of two methods when estimating refill adherence in patients using bisphosphonates with different dosing regimens. In the Swedish Prescribed Drug Register, 18,203 new users of bisphosphonates aged 18-85 years were identified between 1 July 2006 and 30 June 2007 and followed for a maximum of 2 years. The patients were categorised based on dosing regimen: one tablet daily, one tablet weekly, switching between these regimens, and other regimens. Refill adherence was estimated with Continuous measure of Medication Acquisition (CMA, adherent if CMA a parts per thousand yenaEuro parts per thousand 80 %) and the maximum gap method (adherent if gaps less than 45 days). Differences in adherence between patients in the groups were assessed with logistic regression models controlling for confounding factors. The proportion of patients classified as adherent was higher using CMA compared with patients classified as adherent using the maximum gap method. Patients on one tablet weekly had significantly lower adherence compared with patients on one tablet daily in the main analyses of both methods (the maximum gap method: 73 % vs. 80 %; adjusted OR = 0.71; 95 % CI 0.57-0.89 and CMA: 84 % vs. 88 %, adjusted OR = 0.75; 95 % CI 0.57-0.99). Patients using the other two dosing regimens had significantly lower adherence compared with patients on one tablet daily using both methods. Choice of method has an impact on the estimates of refill adherence to bisphosphonates. Patients on one tablet weekly dosing had lower adherence compared with patients on one tablet daily dosing using both methods.

Place, publisher, year, edition, pages
Springer Verlag (Germany) , 2014. Vol. 70, no 5, 589-597 p.
Keyword [en]
Medication adherence; Swedish Prescribed Drug Register; Dosing regimen; Bisphosphonates
National Category
Social and Clinical Pharmacy
Identifiers
URN: urn:nbn:se:liu:diva-106673DOI: 10.1007/s00228-014-1649-2ISI: 000334422700011OAI: oai:DiVA.org:liu-106673DiVA: diva2:718505
Available from: 2014-05-21 Created: 2014-05-19 Last updated: 2017-12-05

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Jönsson, Anna K

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