Assessment of Analgesic Efficacy of Bilateral Lumbar Erector Spinae Plane Block for Postoperative Pain following Lumbar Laminectomy: A Single-Blind, Randomized Clinical Trial

Figure 2

The trend of the changes in pain score on the numerical rating scale (NRS) in the recovery room and ward, compared between the erector spinae plane (ESP) block and control groups. Effect of time on NRS: ; group effect: ; group and time interaction effect: . Recovery room values: t = 15: , t = 30: , t = 45: , and t = 60: . Ward values: t = 1: , t = 2: , t = 3: , t = 4; , t = 5; , t = 6: , t = 8: , t = 10: , t = 12: , t = 16: , t = 20: , and t = 24: .