Table 1.

Summary of Literature on Spiral Ganglion Cell Counts

Subject Category	Number of Cases	Range of SGC Survival	Mean SGC Survival	Reference
Normal Adults	12	29,802 – 39,520	33,915	Hinojosa and Marion, 1983
Potential Implant Candidates	26*	1,444 – 31,284	12,021	Incesulu and Nadol, 1998
	15**	7,305 – 25,783	16,318	Hinojosa and Marion, 1983
	11**	4,752 – 18,936	11,884	Khan et al., 2005b
Deaf, Implanted Adults	14	2,286 – 24,536	11,761	Fayad and Linthicum, 2006
	11	2,471 – 15,023	8,688	Khan et al., 2005b
	10	1,701 – 17,901	8,469	Fayad et al., 2009
	15	1,443 – 15,023	7,969	Khan et al., 2005a
	8	391 – 17,418	6,872	Nadol et al., 2001

Criteria for potential implant candidacy:

^*Pure tone average (PTA) of 70 dB or greater and speech discrimination < 30%

^**PTA of 90 dB or greater and no speech discrimination.