Age- and size-related reference ranges: a case study of spirometry through childhood and adulthood.

Stat Med · 2009 · PMC2798072 · PMID 19065626

Europe PMC DOI

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highly significantno p-value reported

In both the sexes, the log height coefficients for FEV 1 /FVC are tiny but highly significant, the age trends are broadly linear and highly significant and the variability is age-dependent.

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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.