Transbronchial biopsy from the upper pulmonary lobes is associated with increased risk of pneumothorax - a retrospective study.

BMC Pulm Med · 2019 · PMC6397442 · PMID 30823915

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did not reach statistical significanceno p-value reported

This did not reach statistical significance as the study was severely underpowered; only 3 cases of PTX were reported [ 14 ].

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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.