The safety and efficacy of ultrasound-guided erector spinae plane block in postoperative analgesic of PCNL: A systematic review and meta-analysis.

PLoS One · 2023 · PMC10348577 · PMID 37450461

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The sentences

may not be significantno p-value reported

Based on the subgroup-analysis, the result showed that the postoperative analgesic effect of tramadol may not be significant.

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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.