Fig. 2

Penehyclidine reduced the incidence and mitigated the severity of PONV in patients undergoing strabismus surgery. a The overall incidence of PONV were recorded within 48 h after tracheal extubation. b The severity of PONV was scored using a numeric rank scoring system ranging from 0 to 3, wherein 0 represented no nausea and no vomiting and 3 represented vomiting on more than two occasions. ^**P < 0.01 analyzed by Fisher’s exact test (a) or by Mann-Whitney U test (b). The numbers of patients are shown in the figures. PONV, postoperative nausea and vomiting