The association between personality types and medication adherence among adult hypertensive patients

ABSTRACT

OBJECTIVE: To investigate the prevalence of adherence to antihypertensive medication and its association with personality types among adult hypertensive patients. DESIGN AND METHODS: This was a cross-sectional study, which used the Big Five Inventory to assess personality types and Morisky Medication Adherence Scale (MMAS-8) to measure antihypertensive medication adherence, among a convenience sample of 301 hypertensive primary-care patients. Chi square tests, t-tests, correlations and regression techniques were used to examine associations between variables. RESULTS: The mean MMAS-8 score was 5.00 ñ 1.69. Most respondent (60%) demonstrated low adherence (score <6) with only 7% achieving high adherence (score = 8). Persons who scored highly for neuroticism were less likely to be adherent [OR = 0.30; (0.10-0.88)], as were the employed compared to the unemployed [(OR = 0.34; (0.14-0.86)]. In contrast, older persons demonstrated higher adherence levels [(OR = 1.06 (1.01-1.11)]. Regression model variables accounted for 13% of variance in antihypertensive adherence. CONCLUSIONS: This sample demonstrated low antihypertensive adherence; lowest for those high on the neuroticism scale, the employed and younger participants. This implies personality type should be considered in managing chronic diseases to identify clients requiring intervention, thereby improving control, reducing morbidity and enhancing efficient use of scarce resources. Efforts are also needed to address other risk factors that impact adherence.