Impact of Scotland's comprehensive, smoke-free legislation on stroke.

PLoS One · 2013 · PMC3648581 · PMID 23667497

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did not reach statistical significanceno p-value reported

The investigators demonstrated a dose relationship between cotinine level and risk of stroke but this did not reach statistical significance.

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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.