Figure 3 Relationship between onset of tinnitus and PTA of affected ear in dB, PTA of unaffected ear in dB, and differences between PTAs of affected and unaffected ears in dB. Box plots show individual PTAs in tinnitus and no tinnitus group. dB, decibel; 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