Health literacy is a necessary factor affecting self-care behaviors. This randomized control trial research aimed to study the effects of a health literacy improvement program on self-care behaviors and health outcomes in older adult patients with diabetes and hypertension comorbidities. Older adults at a private primary care unit, Bangkok, Thailand; aged 60-69 years, who had been diagnosed with diabetes and hypertension, were selected by simple random sampling into experimental and control groups, of 30 people each. The experimental group received eight weeks of a health literacy improvement program. Group activities were held in three sessions at 4-week intervals. The control group received standard care only. Data were collected by using interview questionnaires at baseline, post-intervention, and follow-up. Research instrumentation included collected data on general characteristics and illness history. Health literacy, self-care behavior, healthy eating, physical activity, stress management, and medication adherence scales were also included. In addition, blood pressure and HbA1C were examined at baseline and follow-up. Descriptive statistics, independent t-test, chi-square,
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