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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