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BioMed Research International
Volume 2015, Article ID 149573, 8 pages
Research Article

Effects of Adherence to Statin Therapy on Health Care Outcomes and Utilizations in Taiwan: A Population-Based Study

Institute of Health Care Management, National Sun Yat-sen University, 70 Lien-Hai Road, Kaohsiung 804, Taiwan

Received 22 May 2015; Revised 3 August 2015; Accepted 3 August 2015

Academic Editor: Elísio Costa

Copyright © 2015 Ying-Chun Li and Wei-Ling Huang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Aim. Good medication adherence may decrease the probability of worse outcomes and reduce unnecessary medical care costs. This study aims to evaluate medication adherence for people on statin therapy. Methods. National health insurance databases were analyzed from January 1, 2001, to December 31, 2007. Study samples were patients of 45 years and older adults who took statin for the first time during the study period. Medication possession ratio (MPR) was measured until the patients had hospitalization or reached the three-year follow-up period. We identified a good (MPR ≥ 80%) and a poor (MPR < 80%) medication adherence group to conduct statistical analyses. Results. 40.8% of patients were of good medication adherence and 59.2% were of poor medication adherence. Multivariate logistic regression model indicated that the MPR ≥ 80% group had significantly less probability of hospitalization (). Being men, increasing age, higher Charlson Comorbidity Index (CCI) scores, seeking care mostly in the medical center or teaching hospitals, and living in the suburban or rural areas had higher probability of hospitalization ( or ). The MPR ≥ 80% group spent less hospitalization expenditures (). Conclusion. Effective interventions may be applied to the poor medication adherence group in order to improve their health care outcomes.