Table 3.

Data analysis of included trials.

Outcome or subgroup	Studies	Participants	Statistical method	Effect estimate
1.1 Operative time (min)	4	265	Mean difference (IV, fixed, 95% CI)	−0.20 [−3.87, 3.47]
1.2 Total rescue analgesics	2	148	Mean difference (IV, fixed, 95% CI)	−8.90 [−20.36, 2.56]
1.3 NRS at 24 hr	2	172	Mean difference (IV, random, 95% CI)	−1.53 [−2.35, −0.71]
1.4 Occurrence rate of nausea and vomiting	2	140	Odds ratio (M-H, fixed, 95% CI)	0.39 [0.13, 1.16]
1.5 Occurrence rate of urinary retention	2	140	Odds ratio (M-H, fixed, 95% CI)	0.20 [0.05, 0.80]

CI = confidence interval, IV = inverse variance, M-H = Mantel–Haenszel, NRS = numerical rating scale.