Assessment of pressure pain thresholds in collisions with collaborative robots.

PLoS One · 2019 · PMC6497239 · PMID 31048921

Europe PMC DOI

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failed to reach significanceno p-value reported

At all 15 measurement sites, the pain threshold was positively associated with age; the association failed to reach significance at the forehead, index finger pad, or the back of the hand.

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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.