Data analysis
hypertension
HYPERTENSION
A power calculation was performed before the trial was initiated. After consulting previous literature on hypertension self-management interventions compared with usual care, an average difference in the decrease in SBP of 5.5 mmHg was suggested between baseline and after 12 months. Assuming a mean difference of 5 mmHg, a standard deviation of 20 mmHg in both groups, and a 20% drop-out, 423 patients in each group were required for 90% statistical power, at the 5% significance level.As stated in the study protocol [IBM SPSS statistics 27 (IBM Corp. Released 2020. IBM SPSS Statistics for Windows, Version 27.0, IBM Corp, Armonk, New York, USA) was used for all statistical analyses.