Fig. 4From: S-ketamine as an adjuvant in patient-controlled intravenous analgesia for preventing postpartum depression: a randomized controlled trialVisual analog scale (4a) and Ramsay sedation scale (4b) scores at different time points after cesarean delivery. **P < 0.05 at 4, 8, 12, 24, and 48 h (T1, T2, T3, T4) after the onset of patient-controlled intravenous analgesiaBack to article page