An investigation into the effect of a text-message based intervention on managing high blood pressure for people in the community.

Potential participants will be identified after completing a health check at a SiSU Health(TM) check station in Priceline pharmacies in all states of Australia excluding New South Wales (NSW). A formula within the SiSU health check machines will check if participants meet all inclusion criteria. If eligible a notification page will appear on screen. Participants will be given the following choices: - “Yes, I’m in!” – participant will be enrolled in the study and emailed the participant information sheet. - “Unsure need more information” – Participant will be sent the Participant Information Statement (PIS) along with a link to opt-in to the study. - “No, I don’t want to take part” – The potential participant will not be enrolled in the study. Eligible participants will receive an email from SiSU Health with specific, actionable advice, and participants randomised to intervention will receive a series of semi-personalised text messages aimed to guide, support, remind and educate on blood pressure (BP) management. The CHeCCK (Consumer-led Hypertension Care in Community-based Kiosks) intervention is a co-designed intervention with content developed and iteratively improved through multiple review cycles by academics, clinicians and consumers. The content aims to inform participants about the nature and consequences of high BP and prompt action, and behaviour changes to improve BP management. Participants will receive 15 text messages over 30 days, the text messages will provide information on 1) high blood pressure, 2) where participants should access care and what to expect from a visit to a health care provider 3) why managing blood pressure is important 4) lifestyle changes for managing high blood pressure and 5) the value of medications for managing high blood pressure. The content of messages will be tailored according to whether the participant’s BP is measured as high BP (greater than or equal to 140-159 and/ or 90-99 mmHg) or very high BP (greater than or equal to 160 and/ or 100mm Hg). The content of the messages will be tailored based on the participant's BP, the messages to those with very high BP have greater urgency, than those to people with people with high BP. We will check if the messages have been delivered to the intended recipient but we will not check if they read the messages. Participants randomised to the control group with receive usual care from SiSU Health. SiSU Health have created a one-page automated email which users who record a high blood pressure reading will receive. This email contains an easy-to-understand summary of what it means to have high blood pressure, common causes, a recommendation to re-check your blood pressure and if still high to see your doctor. For this study we will use this email as the standard of care for the control arm.