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Gardner-Robertson scale for hearing function[1]

Gardner-Robertson scale for hearing function[1]
Grades Pure tone audiogram (dB) Speech discrimination (%)
I 0 to 30 70 to 100
II 31 to 50 50 to 69
III 51 to 90 5 to 49
IV 91 to max 1 to 4
V Not testable 0
Reference:
  1. Gardner G, Robertson JH. Hearing preservation in unilateral acoustic neuroma surgery. Ann Otol Rhinol Laryngol 1988; 97:55.
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