Repeated Blood Pressure Checks Exposed a Hidden Hypertension Burden in Rural Sidama
In rural Sidama Region, Ethiopia, undiagnosed hypertension emerged as a substantial and largely silent problem among adults aged 45 years and older. Using a two-step diagnostic approach, investigators identified prevalence estimates ranging from 7.7% to 14.3%, depending on how the repeat blood pressure assessment was applied. The spread is clinically meaningful because it shows how a single reading can miss people who carry elevated cardiovascular risk without any prior label or treatment.
The study enrolled 2,875 adults through a community census in selected rural kebeles of Shebedino district and relied on a field-based diagnostic strategy rather than a facility-only sample. That setting matters. In rural communities, hypertension often remains invisible until stroke, heart failure, kidney injury, or another end-organ event forces contact with the health system. A screening program that waits for symptoms will miss the very patients most likely to benefit from early detection.
A Two-Step Method Changed What Screening Captured
Blood pressure was defined conventionally as systolic pressure at least 140 mm Hg or diastolic pressure at least 90 mm Hg in people without a previous history of hypertension. Repeated measurement reduced the risk that one elevated reading, anxiety, exertion, or measurement noise would distort the prevalence estimate. Even with that more conservative approach, the burden remained sizable. Previously diagnosed hypertension accounted for only 3.3% of the cohort, leaving a much larger reservoir of people who had not yet been identified.
The finding is a reminder that prevalence depends on how carefully a population is assessed. In settings where prior contact with care is limited, repeated measurement does more than refine an estimate; it changes who enters the clinical conversation. A person with persistently high blood pressure but no diagnosis sits outside treatment pathways, outside counseling, and outside the medication supply chain that could reduce stroke and cardiovascular events.
Female Sex, Older Age, and Substance Use Marked Higher Risk
Several factors were independently associated with undiagnosed hypertension. Female sex carried an adjusted odds ratio of 2.02, with a 95% confidence interval of 1.44 to 2.82. Age 65 years and older was associated with an adjusted odds ratio of 1.48, with a 95% confidence interval of 1.01 to 2.15. A history of alcohol drinking and khat chewing was also associated with undiagnosed hypertension, with an adjusted odds ratio of 2.94 and a 95% confidence interval of 1.52 to 5.66.
These associations fit known physiology. Aging stiffens arteries, raises systolic load, and narrows the margin before blood pressure becomes persistently abnormal. Substance use can amplify sympathetic activation, worsen vascular tone, and disrupt long-term cardiovascular health behaviors. Female sex may reflect a combination of access barriers, lower screening exposure, and social patterns that shape when and where blood pressure is checked. The data do not prove causality, but they identify the communities where missed diagnoses are most likely to accumulate.
One result stands out sharply.
Lack of prior blood pressure measurement carried an adjusted odds ratio of 5.60.
Health Awareness and Screening History Were Strongly Tied to Detection Gaps
Awareness of salt-related health risks also mattered. Participants who lacked that awareness had an adjusted odds ratio of 3.14 for undiagnosed hypertension, with a 95% confidence interval of 2.30 to 4.30. In practical terms, this points to a knowledge gap that sits upstream of diagnosis. If people do not understand the connection between dietary salt and blood pressure, they are less likely to recognize why screening is relevant or why persistent elevation requires attention even in the absence of symptoms.
The absence of any prior blood pressure measurement was one of the strongest predictors in the analysis. That result reveals a health-system gap as much as an individual one. A person who has never had blood pressure checked cannot enter a cascade of diagnosis, counseling, monitoring, and treatment. In resource-limited rural settings, that single missed contact can preserve a dangerous false sense of health for years.
Rural Screening Needs to Reach Adults Before Complications Appear
The prevalence estimate of 7.7% to 14.3% places undiagnosed hypertension among the most important hidden chronic disease burdens in this population. The variation likely reflects the study’s diagnostic approach, but the central message is unchanged: many adults with elevated blood pressure remain outside care. Because hypertension is usually asymptomatic until late complications develop, case detection depends on deliberate measurement, not complaint-driven consultation.
For local health services, the findings support systematic community screening for adults 45 years and older, especially women, older adults, and people with alcohol or khat exposure. The study also argues for integrating salt-risk counseling into routine outreach, since poor awareness was independently tied to undiagnosed disease. Screening without education may find more cases, but it will not by itself reduce future blood pressure burden if people do not understand what the numbers mean or why follow-up matters.
The result set also has a broader public health implication. Rural hypertension programs often focus on patients already known to clinics, yet this study shows that the larger problem may lie outside the registry entirely. Repeated blood pressure measurement uncovered disease that single encounters or passive case-finding could easily miss. In a setting where cardiovascular prevention depends on early identification, that gap is not administrative; it is clinical.
Measurement Strategy, Not Symptoms, Will Define the Next Step
This cross-sectional study cannot determine how many of these newly detected cases will progress to complications, or how many will later enter treatment. It also cannot explain whether the observed associations would hold in other Ethiopian rural regions with different dietary patterns, health access, or substance-use profiles. Even so, the message from Shebedino district is direct: routine screening has to precede the stroke, the heart failure admission, and the renal decline that so often reveal hypertension too late.
A practical screening program in this setting would need repeated blood pressure measurement, outreach beyond the clinic, and simple counseling tied to salt intake and cardiovascular risk. Without that, undiagnosed hypertension will remain hidden in plain sight among older adults living in rural communities.