Reference percentiles for FEV(1) and BMI in European children and adults with cystic fibrosis.

Orphanet J Rare Dis · 2012 · PMC3520808 · PMID 22958330

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may be significantno p-value reported

Little selection bias is expected in countries with large coverage, while it may be significant in countries where participation is limited to some voluntary CF centers.

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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.