. Author manuscript; available in PMC: 2019 Mar 15.

Published in final edited form as: World Neurosurg. 2012 Apr 5;80(3-4):359–363. doi: 10.1016/j.wneu.2012.04.001

Table 1.

Gardner Robertson Scale (10)

Grade	Description	Pure Tone Audiogram, dB	Speech Discrimination, %
I	Good—excellent	0–30	70–100
II	Serviceable	31–50	50–69
III	Nonserviceable	51–90	5–49
IV	Poor	91-max	1–4
V	None	not testable	0

If pure tone audiogram and speech discrimination do not correlate, the lower class is used.