Figure 3. Vertigo attacks 6 months after treatment. There was no statistically significant difference in the number of vertigo attacks 6 months after treatment between the observation and control groups (t=1.036, p=0.302) (A). Attacks in the IgG high-expression group were significantly more frequent than those in the IgG low-expression group (t=2.650, p=0.009) (B). Attacks in the IgM high-expression group were significantly more frequent than those in the IgM low-expression group (t=3.030, p=0.003) (C). Note: ** indicates p<0.01.