Rhinitis in children less than 6 years of age: current knowledge and challenges.

Asia Pac Allergy · 2011 · PMC3206246 · PMID 22053307

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showed a trendno p-value reported

Two birth cohort studies monitoring the natural history of childhood rhinitis [ 5 , 6 ] showed a trend of increasing prevalence over time from infancy to adolescents.

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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.