Table 6.

Differences Between Audiometric Pure Tone Thresholds and IC OR Thresholds at Different Time Points (TSO—1–3 Days After Surgery; FF—5 Weeks After Surgery).

	250 Hz	500 Hz	1000 Hz
	Mean ± standard deviation in dB, correlation
Preoperative audiogram vs. postinsertion IC OR ${\Delta }_{\text{IC}\hspace{1em}\text{OR}\hspace{1em}\text{post}\hspace{1em}\text{ins}-\text{Audio}\hspace{1em}\text{pre}}$	26.0 ± 14.5 $r=$ .82**	16.3 ± 10.3 $r=$ .88***	2.5 ± 22.5 $r=$ −.08
Postoperative audiogram (TSO) vs. postinsertion IC OR ${\Delta }_{\text{IC}\hspace{1em}\text{OR}\hspace{1em}\text{post}\hspace{1em}\text{ins}-\text{Audio}\hspace{1em}\text{TSO}}$	−6.0 ± 21.7 $r=$ .68*	−18.2 ± 13.9 $r=$ .81**	−27.0 ± 18.3 $r=$ .47
Postoperative audiogram (FF) vs. postinsertion IC OR $\Delta \text{IC}\hspace{1em}\text{OR}\hspace{1em}\text{post}\hspace{1em}\text{ins}-\text{Audio}\hspace{1em}\text{FF}$	−4.5 ± 33.8 $r=$ .42	−17.7 ± 24.5 $r=$ .49	−27.5 ± 22.4 $r=$ .13
Postoperative audiogram (TSO) vs. postoperative IC OR (TSO) $\Delta \text{postop}(\text{TSO})\text{IC}\hspace{1em}\text{OR}-\text{Audio}$	11.5 ± 18.0 $r=$ .79**	−7.4 ± 12.9 $r=$ .83**	−15.0 ± 10.0 $r=$ .72*
Postoperative audiogram (FF) vs. postinsertion IC OR (FF) $\Delta \text{postop}(\text{FF})\text{IC}\hspace{1em}\text{OR}-\text{Audio}$	12.0 ± 17.5 $r=$ .98***	−5.9 ± 11.8 $r=$ .91***	−23.0 ± 11.4 $r=$ .72*

Note. OR = ongoing response; IC = intracochlear; FF = first fit; TSO = test switch-on.

^*p < .05 (significant), **p < .01 (high significant), ***p < .001 (highly significant).