Fig. 2

Incidence of visceral pain recovery at 10 (A), 20 (B), and 30 min (C) and distribution of visceral pain scores at 10 min (D). Data are frequency. Group I: Propofol and Butorphanol; Group II: Propofol and Saline. Visceral pain was defined as ≥ 1 of the visual analog score (VAS). The incidence of visceral pain at 10 min in the recovery room was found to be significantly lower in Group I than in Group II (propofol and butorphanol vs. propofol and saline, respectively; χ2 = 9.157, P = 0.002, RR: 2.738, 95% CI [1.409- 5.319]. The white bar indicates patients with VAS 0, and the black bar indicates patients with more than VAS 1