Methods This randomised controlled trial was undertaken in 24 general practices in the UK. Patients aged 35–85 years
were eligible for enrolment if they had blood pressure more than 140/90 mm Hg despite antihypertensive treatment
and were willing to self-manage their hypertension. Participants were randomly assigned in a 1:1 ratio to selfmanagement,
consisting of self-monitoring of blood pressure and self-titration of antihypertensive drugs, combined
with telemonitoring of home blood pressure measurements or to usual care. Randomisation was done by use of a
central web-based system and was stratifi ed by general practice with minimisation for sex, baseline systolic blood
pressure, and presence or absence of diabetes or chronic kidney disease. Neither participants nor investigators were
masked to group assignment. The primary endpoint was change in mean systolic blood pressure between baseline
and each follow-up point (6 months and 12 months). All randomised patients who attended follow-up visits at
6 months and 12 months and had complete data for the primary outcome were included in the analysis, without
imputation for missing data. This study is registered as an International Standard Randomised Controlled Trial,
number ISRCTN17585681.