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

From: Topical insulin-like growth factor 1 treatment using gelatin hydrogels for glucocorticoid-resistant sudden sensorineural hearing loss: a prospective clinical trial

Improvement Criteria
Complete recovery Recovery of a hearing level within 20 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 More than 30 dB recovery in the mean hearing level at the five frequencies tested
Slight recovery Recovery of 10 to 29 dB in the mean hearing level at the five frequencies tested
No recovery Less recovery than 10 dB in the mean hearing level at the five frequencies tested