Table 5.

Subgroup analysis of need for rescue analgesia.

Outcomes of interest		No. of patients		Effect estimate		Heterogeneity
	No. of studies	Experimental	Control	WMD/OR (95% CI)	P -value	I2 (%)	P -value
Analgesics vs. Controls
NSAIDs vs. Controls	2	109	109	0.25 (0.06, 0.99)	0.05	45	0.18
Opioids vs. Non-opioids
Opioids vs. NSAIDs	4	83	84	0.56 (0.24, 1.32)	0.18	0	0.90
Opioids vs. Local anaesthetics	2	70	71	0.02 (0.00, 0.08)	<0.00001	0	0.81

WMD, weighted mean difference; OR, odds ratio; CI, confidence interval; NSAID, non-steroidal anti-inflammatory drug.