Comparison 1. Betahistine versus placebo ‐ number of vertigo attacks.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Vertigo ‐ number of attacks per month at baseline	1	72	Mean Difference (IV, Fixed, 95% CI)	1.16 [‐2.78, 5.10]
1.2 Vertigo ‐ number of attacks per month at 15 days	1	72	Mean Difference (IV, Fixed, 95% CI)	‐2.32 [‐4.10, ‐0.54]
1.3 Vertigo ‐ number of attacks per month at 1 month	1	72	Mean Difference (IV, Fixed, 95% CI)	‐2.37 [‐3.94, ‐0.80]
1.4 Vertigo ‐ number of attacks per month at 2 months	1	72	Mean Difference (IV, Fixed, 95% CI)	‐2.27 [‐4.40, ‐0.14]
1.5 Vertigo ‐ number of attacks per month at 3 months	1	72	Mean Difference (IV, Fixed, 95% CI)	‐2.74 [‐4.87, ‐0.61]