Prevalence of malocclusion and occlusal traits in the early mixed dentition in Shanghai, China.

PeerJ · 2019 · PMC6450371 · PMID 30972246

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an increasing trendno p-value reported

An increasing trend in the rate of Angle Class III with age was observed, from 5.0% at age 7 to 7.8% at age 9.

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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.