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[Antihypertensive drug medication adherence of people with disabilities and its affecting factors in Korea].

OBJECTIVES
The aims of this study were to estimate the antihypertensive medication adherence in people with a disability and a history of taking antihypertensive medication, and to identify the factors affecting medication adherence.


METHODS
The National Health Insurance claims data were linked with the National Disability Registry. People with a disability, who received a prescription of antihypertensives, were identified from a total of 85,098 cases. Cumulative medication adherence (CMA) was used as an indicator of medication adherence. A CMA>80% was defined as appropriate medication adherence. Multiple logistic regression analysis was used to identify the factors affecting medication adherence.


RESULTS
The average CMA in a total of 85,098 patients was 79.5%. The appropriate adherence (CMA>or=80%) rate was 54.5% and 20.5% of patients had a CMA<50%. Multiple logistic regression analysis revealed that the probability of appropriate adherence decreased with decreasing number of prescription days per visit, increasing number of providers, the patients' residential area moving from urban to rural areas, and when patients have an internal organ disability, auditory impairment, mobility impairment.


CONCLUSIONS
The adherence to antihypertensive medication in people with a disability is influenced by various socio-economic, clinical and regional factors. In particular, the disabled who have locomotive and communication disabilities and internal organ impairments have a higher probability of under-adherence to antihypertensive medication adherence in Korea.