Figure 2 Relationship between PTA of affected ear in dB, PTA of unaffected ear in dB, differences between PTAs of affected and unaffected ears in dB, and age. Scatter plots show individual PTAs and age of patients with ISSHL. dB, decibel; ISSHL, idiopathic sudden sensorineural hearing loss; PTA aff, pure tone average of affected ear; PTA unaff, pure tone average of unaffected ear; PTA aff-unaff, differences between PTAs of affected and unaffected ear