Irritable bowel syndrome is concentrated in people with higher educations in Iran: an inequality analysis.

Epidemiol Health · 2017 · PMC5434229 · PMID 28171714

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a decreasing trendno p-value reported

[ 7 ] reported a decreasing trend of IBS prevalence according to income and education from the lowest to the highest groups.

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an increasing trendno p-value reported

They indicated elsewhere that in medical students, IBS prevalence had an increasing trend according to the academic year of the students [ 27 ].

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.