Hypertension is a major health problem in Nigeria, with local experts advising people to have frequent blood pressure checks.
The president of the Nigerian Cardiac Society, Dr Okechukwu Ogah, told the the News Agency of Nigeria in October 2018 that "one out of every three adults in Nigeria has high blood pressure". He said the rate was rising because people ate unhealthy food and didn't exercise enough.
Is his claim that a third of adults in Nigeria have hypertension up to scratch?
What is high blood pressure?
Hypertension, known as high or raised blood pressure, is a medical condition in which the blood constantly applies too much pressure against the walls of the blood vessels. The heart then has to work harder to pump blood to all parts of the body, the World Health Organisation explains. This increases the risk of heart attack.
Someone is considered hypertensive if their systolic blood pressure is higher than 140 millimetres of mercury (mmHg) or their diastolic blood pressure is higher than 90 mmHg. Systolic blood pressure is measured when the heart is beating, and diastolic blood pressure when the heart rests between beats.
Study finds 28.9% of adults to be hypertensive
Ogah directed Africa Check to the 2015 review of Nigerian hypertension studies from January 1980 and December 2013, published in the Journal of Hypertension.
It analysed 27 population-based studies conducted across Nigeria. The overall sample size was 27,122 people aged 20 and older.
The analysis found 28.9% of these people had high blood pressure (ranging from 25.1% to 32.8%). Among men it was 29.5% overall and among women 25%.
'We can assume over 30% of adults are hypertensive'
Dr Davies Adeloye, the review's corresponding author, said that to his knowledge, it "still remains the most recent (and representative study) country-wide estimate of hypertension originating from within Nigeria itself".
He told Africa Check the study had found that high blood pressure would become more widespread if nothing were done to prevent it.
"This is 2018, and the country's health system and public health measured have not improved. Given the trend from local studies across Nigeria... I think we can safely assume that over 30% of adult Nigerians (aged 20 years or more) are hypertensive."
"Over 30%" is nearly one third, or one in three. We therefore rate the claim as mostly correct.
Conclusion: About one in three adults in Nigeria aged 20 or older have high blood pressure.
Dr Okechukwu Ogah, president of the Nigerian Cardiac Society, said one in three adults in the country had high blood pressure, or hypertension. And the rate was rising because people ate unhealthy food and didn't exercise enough.
A 2015 review of earlier research on high blood pressure in Nigeria found that 28.9% of 27,122 adults aged 20 or older had hypertension.
Dr Davies Adeloye, an author of the review, said the trend it revealed meant "we can safely assume that over 30% of adult Nigerians (aged 20 years or more) are hypertensive".
We therefore rate Ogah's claim as mostly correct.