Fig. 1. Evolution of pain scores before (T0) and from 3 min until 30 min (T3 to T30) after epidural injection in the different groups of parturients. Groups: 150 μg epidural clonidine (C150), 750 μg neostigmine (N750), 75 μg epidural clonidine combined with 250, 500, and 750 μg neostigmine (C75N250, C75N500, and C75N750, respectively). *P < 0.05 with visual analog scale score at T0, before epidural injection.