The Efficacy of Acupuncture for the Treatment of Cervical Vertigo: A Systematic Review and Meta-Analysis

Table 5

Level of evidence (GRADE).

Outcome	Effect		Number of participants (studies)	Quality of the evidence (GRADE)
	Relative effect (95% CI)	Absolute effect (95% CI)
Total effectiveness	RR 1.27; (1.19 to 1.34)	201 more per 100; (from 141 more to 253 more)	914; (10 studies)	OO; Low^1,4
Vertigo	RR 1.15; (1.03 to 1.28)	124 more per 1000; (from 25 more to 231 more)	188; (2 studies)	Very low^1,2,4
Headache	RR 1.3; (1.11 to 1.53)	220 more per 1000; (from 81 more to 389 more)	124; (2 studies)	Very low^1,2,4
Left vertebral artery		MD 2.86 higher; (1.25 to 4.46 higher)	208; (3 studies)	Very low^1,2,3,4
Right vertebral artery		MD 3.52 higher; (1.52 to 5.51 higher)	208; (3 studies)	Very low^1,2,3,4
Basilar artery		MD 2.6 higher; (1.42 to 3.79 higher)	208; (3 studies)	Very low^1,2,4

Most of them did not mention randomization process, allocation concealment, and blinding.
Published evidence is limited due to a small number of trials, all of which are showing benefits.
The heterogeneity is significant.
Publication bias exists.