Table 2. Characteristics of patients who completed the planned protocol.

Mean age and mean hearing level were not significantly different between groups by Wilcoxon signed ranks test. Mean hearing level was not significantly different between initial and follow-up by Wilcoxon signed ranks test. Sex distribution and duration of tinnitus were not significantly different between groups by chi-square test. Group A: control group, treated for 4 weeks with 160 mg/day Ginkgo biloba extract (Ginexin®), Group B: treated for 4 weeks with 1500 mg/day KRG, Group C: treated for 4 weeks with 3000 mg/day KRG. KRG: Korean red ginseng