Fig. 3: Audiogram for the m.1555 A>G carrier in this study and generation-wise average audiograms for the subjects in this study.

a The audiogram pattern of the m.1555 A>G carrier showed bilateral, symmetric, and high-frequency (4 and 8 kHz) hearing loss. The right and left audiograms are indicated as circles on a solid line and crosses on a dashed line, respectively. b The generation-wise average audiograms for the subjects in this study. The white circle indicates 20–29 years old. The white square indicates 30–39 years old. The white diamond indicates 40–49 years old. The black triangle indicates 50–59 years old. The black circle indicates 60–69 years old. The black square indicates 70–79 years old. The black diamond indicates more than 80 years old.