Epidemiology of chronic rhinosinusitis: results from a cross-sectional survey in seven Chinese cities.

Allergy · 2015 · PMC4409092 · PMID 25631304

Europe PMC DOI

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a clear trendno p-value reported

Although a few studies suggest that CRS is more prevalent in people with low socio-economic status ( 12 , 16 ), we did not observe a clear trend of enhanced prevalence with higher education.

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a decreasing trendno p-value reported

The National Health Interview Survey of US adults revealed a decreasing trend in CRS from 16% in 1997 to 14% in 2006 and 12% in 2012 ( 14 , 17 , 18 ).

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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.