Table 1 Criteria of hearing recovery (according to Siegel’s criteria).

From: The therapeutic effect of hyperbaric oxygen therapy in patients with severe to profound idiopathic sudden sensorineural hearing loss

Type

Hearing recovery

I. Complete recovery

Final hearing better than 25 dB

II. Partial recovery

 > 15-dB gain and final hearing 25–45 dB

III. Slight improvement

 > 15-dB gain and final hearing poorer than 45 dB

IV. No improvement

 < 15-dB gain and final hearing poorer than 75 dB

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