Comparison of outcomes for supine vs. prone position ERCP: a systematic review and meta-analysis.

Endosc Int Open · 2018 · PMC6221825 · PMID 30410948

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did not reach statistical significanceno p-value reported

also described a lower procedure time in supine patients (38 minutes) than in prone patients (46 minutes) but the difference did not reach statistical significance 16 .

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an overall trendno p-value reported

There was a small difference in success rate favoring the prone position even in that study with a larger supine group, and indeed, there was an overall trend in the data of the studies mentioned favoring the prone position with regard to technical success.

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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.