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Aust Prescr · 2022 · PMC8882449 · PMID 35233135

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showed a trendno p-value reported

Although one study showed a trend to improved pulmonary artery pressures in those randomised to receive nocturnal oxygen, no benefit was observed in the other study. 8 , 9 The International Nocturnal Oxygen (INOX) trial also investigated patients with COPD and nocturnal desaturation.

also in 53,322 other papers

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.