Table 2.

The meta-analyses on the related complications between 2 groups.

Variables	Number of included RCTs	Heterogeneity (I2)	OR	95%CI	P
The incidence of dizziness	12	23%	1. 85	1.50–2.28	<.001
Incidence of nausea	12	49%	2.17	1.81–2.59	<.001
The incidence of vomiting	6	0%	2.73	1.47–5.09	.001
Incidence of headache	6	6%	1.14	0.79–1.65	.493
Incidence of lethargy	12	71%	2.19	1.39–3.44	<.001
Incidence of insomnia	7	5%	1. 06	0.72–1.55	.171

CI = confidence interval, OR = odd risk, RCT = randomized controlled trial.