Barely Significant
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Dietary supplementations to mitigate the cardiopulmonary effects of air pollution toxicity: A systematic review of clinical trials.

PLoS One · 2024 · PMC11175466 · PMID 38870164

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Additionally, even though it did not reach statistical significance, vitamin B supplementation decreased the pollutant impact on SDNN by 57% [ 27 ].

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borderline significanceno p-value reported
One study assessed the effects of NAC (600 mg three times a day for six days) supplementation on airway inflammation of PM2.5-exposed subjects and showed that the sputum bronchial epithelial cells in hyper-responsive individuals increased after pollutant exposure compared to filtered exposure and this effect was attenuated by NAC supplementation with a borderline significance [ 44 ].

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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.