Prevalence of respiratory conditions among schoolchildren exposed to different levels of air pollutants in the Haifa Bay area, Israel.

Environ Health Perspect · 1990 · PMC1567806 · PMID 2088751

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highly significantno p-value reported

The actual differences in the PFT values are small, but due to sample size many of them are highly significant statistically.

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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.