Fig. 3From: Twelfth thoracic vertebra erector spinae plane block for postoperative analgesia and early recovery after lumbar spine surgery in elderly patients: a single-blind randomized controlled trialNRS pain scores (median (IQR)) within 72 h after surgery. MannWhitney U Test. ** p < 0.01, *** p < 0.001. NRS, numeric rating scalesBack to article page