TABLE 2.

Comparison of multifrequency electrocochleography insertion trajectory parameters using 250- and 500-Hz acoustic stimulus and univariate linear regression with low-frequency pure tone average (125, 250, and 500-Hz) threshold shift from preoperative to 1-month post-activation for all insertions (both perimodiolar and lateral wall electrodes).

		250-Hz			500-Hz
		Mean ± STD or N (%)	r	p	Mean ± STD or N (%)	r	p
Number of Cochlear Microphonic (CM) Amplitude Drops (>2 μV)		2.2 ± 2.3	0.39	0.018	2.1 ± 1.4	0.34	0.05
Largest CM Drop (dB re: 1 μV)		2.3 ± 3.7	0.52	0.002	9.3 ± 6.0	0.39	0.033
Starting CM Amplitude (μV)		11.7 ± 11.7	0.161	0.359	9.1 ± 14.9	0.266	0.117
Final CM Amplitude/Max CM During Insertion * 100%		81.0 ± 20.6	0.023	0.897	70.0 ± 26.5	0.092	0.593
Type of Insertion Pattern	Type A	26 (76.5)	0.112	0.529	11 (32.4)	0.207	0.225
	Type B	6 (17.6)			10 (29.4)
	Type C	2 (5.9)			13 (38.2)