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Table 1 Criteria for hearing improvement determined by Sudden Deafness Research Committee of the Japanese Ministry of Health, Labour and Welfare in 1984

From: A randomized controlled clinical trial of topical insulin-like growth factor-1 therapy for sudden deafness refractory to systemic corticosteroid treatment

Complete recovery

Recovery of a hearing level within 20 decibels (dB) at all five frequencies tested (0.25, 0.5, 1.0, 2.0 and 4.0 kHz) or recovery to the same level as the opposite side in pure-tone auditometry

Marked recovery

30 dB and over recovery in the mean hearing level at the five frequencies tested

Slight recovery

Recovery of better than 10 dB and less than 30 dB in the mean hearing level at the five frequencies tested

No response

Less recovery than 10 dB in the mean hearing level at the five frequencies tested