Table 2.

Summary of meta‐analysis results

Comparison	Results	RR/SMD	95% CI
HB vs. LB	Hypotension	0.64	[0.42, 0.96]a
	Analgesia effects (excellent)	1.5	[0.95, 2.37]
HB vs. LBO	Hypotension	0.52	[0.33, 0.82]a
	Nausea	0.54	[0.23, 1.23]
	Vomiting	0.41	[0.23, 0.74]a
	Prurities	16.13	[3.39, 76.74]a
	Shivering	0.25	[0.06, 1.03]
	Paturients need analgesics	2.56	[0.77, 8.48]
	Total dose of ephedrine	(SMD) −0.88	[–1.28, –0.49]b
	Effective analgesia time	(SMD) 3.86	[–1.49, 9.22]

^aa 95% CI did not include 1 for RR.

^ba 95% CI did not include 0 for SMD.