Fig. 4From: Ultrasound-guided ilioinguinal-iliohypogastric block (ILIHB) or perifocal wound infiltration (PWI) in children: a prospective randomized comparison of analgesia quality, a pilot studyRelative frequency of pain as a function of group and measurement times within the measurement episode (PACU, OSW, at home), 1–12 = measurement times within 24 hBack to article page