The symbols "○" for the right ear and "x" for the left ear indicate the auditory threshold for a stimulus transmitted through the air of a frequency ranging from 125 to 800 MHz. The symbols ">" for the right ear and "<" for the left ear represent the auditory threshold for a stimulus transmitted through the bone of a frequency ranging from 250 to 4000 MHz. The presented audiogram allows the calculation of the Pure Tone Average (PTA) for the central frequencies which quantifies the average auditory deficit as 61 dB for the right ear and 62 dB for the left ear. At the bottom of the figure the auditory thresholds of the stapedial reflex are shown.
Orsoni et al. Orphanet Journal of Rare Diseases 2010 5:18 doi:10.1186/1750-1172-5-18