“…In the subgroup analyses of nonlaparoscopic surgery, compared with WI, TAP block was associated with lower pain scores at rest at 2 h (MD = −0:69, 95% CI (-1.23, -0.16), I 2 = 4%), 6 h (MD = −0:79, 95% CI (-1.22, -0.36), I 2 = 0%), and 24 h (MD = −0:58, 95% CI (-0.90, -0.26), I 2 = 15%) but not at 1 h (MD = −0:32, 95% CI (-1.15, -0.52), I 2 = 64%), and in the subgroup analyses of laparoscopic surgery, compared with WI, TAP block was also associated with lower pain scores at rest at 2 h (MD = −0:94, 95% CI (-1.79, -0.08), I 2 = 2%), 6 h (MD = −0:89, 95% CI (-1.13, -0.65), I 2 = 0%), and 24 h (MD = −0:53, 95% CI (-0.75, -0.31), I 2 = 10%) but not at 1 h (MD = −0:30, 95% CI (-0.63, 0.03), I 2 = 44%) ( Fig S1 to Fig S4). Moreover, in the subgroup analyses of the surgical site in the upper abdomen, compared with WI, TAP block was associated with lower pain scores at rest at 2 h (MD = −0:94, 95% CI (-1.79, -0.08), I 2 = 2%), 12 h (MD = −0:74, 95% CI (-1.28, -0.20), I 2 = 1%), and 24 h (MD = −0:69, 95% CI (-1.00, -0.39), I 2 = 0%) but not 3 [12,17,23], no study reported postoperative pain scores during movement at 12 h, and five studies reported postoperative pain scores during movement at 24 h [14,15,17,23,24]. Compared with WI, TAP block was associated with lower pain scores during movement at 2 h (MD = −1:47, 95% CI (-2.32, 0.62), P = 0:0007), 4 h (MD = −0:65, 95% CI (-1.24, 0.06), P = 0:03), 6 h (MD = −0:73, 95% CI (-1.23, 0.24), P = 0:004), and 24 h (MD = −0:85, 95% CI (-1.16, 0.53), P < 0:00001) but not at 1 h (MD = −1:04, 95% CI (-2.07, 0.00), P = 0:05), and there were low levels of heterogeneity in five analyses (for 1 h: I 2 = 4%; for 2 h: I 2 = 0%; for 4 h: I 2 = 0%; for 6h: I 2 = 0%; and for 24h: I 2 = 0%) ( Figures 10-14).…”