This study adopted a randomized-controlled and intervention research method. Data were collected between September 2022 and February 2023 at the internal medicine outpatient clinic of Adana City Hospital.
Participants were recruited using random sampling. Simple randomization was used to allocate both groups equally and randomly (https://www.randomizer.org/). The researcher first created a randomization list. Then, she assigned participants to the intervention and control groups according to the list. Blinding was impossible because the research involved a training program. A power analysis (G\*Power 3.1.9.4) was performed based on the effect size (d = 0.93) reported by Zhang et al. (Zhang et al., 2021). The results showed that a sample of 62 would be large enough to detect significant between-group differences (power 95%, margin of error 5%, and confidence interval 95%). The results showed that a sample of 42 was large enough to detect significant differences \[alpha= 0.05 and power (1- beta) 0.80\]. However, each group comprised 23 participants to avoid missing data and the execute parametric tests.Data were collected using a personal information form, the Hypertension Self-Efficacy Scale (HSES), the Modified Morisky Scale (MMS), and the Adaptation to Chronic Illness Scale (ACIS). The inclusion criteria were (1) having had hypertension at least for six months, (2) being an adult (over 18), (3) not having received training on hypertension before, (4) having no communication problems, (5) not being pregnant, and (6) volunteering.
