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Does Nigeria have the most people with diabetes in sub-Saharan Africa?

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Does Nigeria have the most people with diabetes in sub-Saharan Africa?

2nd November 2017

By: Africa Check

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Diabetes is a growing concern for Nigeria, a drug multinational executive said ahead of a recent summit on the chronic disease in Lagos.

“About three years ago South Africa and Ethiopia tended to have more diabetes than Nigeria,” said Dr Philip Ikeme, the medical director of the Nigeria, Ghana and eastern African arm of pharmaceutical giant Sanofi. Among Sanofi’s products are the insulin shots used to manage diabetes.

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“Now Nigeria has the highest incidence of diabetes in sub-Saharan Africa.” (Note: Incidence refers to the number of new cases in a given period, say a month or a year, while prevalence is the total number of people in a population with a disease in a specific time period.) 

“In terms of actual numbers we are looking at five million people whom we know have diabetes,” Ikeme said, adding that the actual number was “much more”.

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Does the data support Ikeme’s claim? We examined the numbers.

What is diabetes?

Diabetes is a chronic disease caused by the body’s inability to produce required amounts of insulin – the hormone that regulates blood sugar – or to efficiently use the insulin it produces, according to the World Health Organisation. These are called type 1 and type 2 diabetes respectively.

In 2015, it was the 6th leading cause of death in lower and middle income countries. WHO notes that over the past decade, the prevalence of diabetes has risen faster in low and middle-income countries than in high-income ones. It estimates that in 2014, about 25 million people in sub-Saharan Africa were living with the disease, up from 4 million in 1980.

If not well controlled, diabetes may cause blindness, kidney failure and lead to limb amputation, in addition to other long-term consequences.

Claim: “Nigeria has the highest incidence of diabetes in sub-Saharan Africa.”

Verdict: unproven

In support of his claims, Ikeme directed Africa Check to two studies on diabetes in Nigeria. One, a 2008 study, cited WHO estimates that 1.7 million Nigerians were living with diabetes while the other put the number at 4 million in 2014.

“I fear the [media] reports may be slightly overrepresented as the publications indicate that about 4 million are suggested to have diabetes and 70%-80% of these remain undiagnosed. The prevalence of known diabetes is suggested at 1.7 million Nigerians.”

Ikeme specifically spoke of new cases of diabetes in Nigeria (incidence) at the media briefing. But the World Health Organisation’s most recent report on diabetes does not include specific data on new cases in Nigeria or sub-Saharan Africa, saying that data is “generally lacking.”

There isn’t any such diabetes data from the global health agency or any other source, Dr Gojka Roglic, who is with the WHO’s department for non-communicable diseases, told Africa Check.

WHO noted that in 2015, only 17% of countries in sub-Saharan Africa had a diabetes registry.

“However, no data is available on incidence for any country in Africa, so the claim is unsubstantiated,” Roglic added.

Claim: “Over five million Nigerians are living with either the type 1 or type 2 diabetes.”

Verdict: mostly-correct

The World Health Organisation’s most recent data on Nigeria estimates a prevalence of 4.3% in adults (18 years and older) for the years 1980 to 2014, the health agency’s Dr Gojka Roglic told Africa Check.

“Given that there are about 90 million adults in Nigeria by United Nations 2015 estimates, the number of adults with diabetes comes to around 3.9 million,” he said. The prevalence in Nigerian children isn’t known, but it wouldn’t “substantially change the total”, Gojka added.

According to the International Diabetes Federation, an estimated two thirds of people with diabetes in Africa are undiagnosed. In Nigeria the last nationwide survey on the burden of diabetes was in 1997.

“Because we have poor routine health data collation in Nigeria those [IDF and WHO] estimates are not really reflective of what is happening in the country,” Dr Davies Adeloye, who is with the department of demography and social statistics at the Covenant University in Ogun State told Africa Check.

This informed an analysis of 42 studies done on diabetes in Nigeria between 1985 and 2016 in which Adeloye is a co-author. The research, published in October 2017, found that about 4.7 million Nigerians aged between 20 and 79 years had type 2 diabetes.

It would thus be correct to say more than five million Nigerians have the two common types of diabetes, said Adeloye.

“Even from the IDF and WHO estimate, 80% of that estimate goes for type 2 diabetes. That means there could be an interval of 20% for other types of diabetes,” he explained. “So if 4.7 million is 80%, and if we want to model, we could say more than 5 million Nigerians are living with diabetes.”

Researched by David Ajikobi. This report was written by Africa Check, a non-partisan fact-checking organisation. View the original piece on their website

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