Fig. 3From: Heart rate monitoring to detect acute pain in non-verbal patients: a study protocol for a randomized controlled clinical trialA power contour plot. Power analysis suggests that a paired samples t-test including 38 participants will reliably detect (power = 80%) an effect size of 0.82, or higher. Statistical power is also shown by assuming smaller or larger hypothetical effect sizes. Analysis and visualisation were performed using the ‘jpower’ JAMOVI module: https://github.com/richarddmorey/jpowerBack to article page