Table 5.

Differences Between Audiometric Pure Tone Thresholds and EC 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. preinsertion OR ${\Delta }_{\text{EC}\hspace{1em}\text{OR}-\text{Audio}}$	47.0 ± 23.1 $r=$ .32	25.2 ± 24.2 $r=$ .10	8.0 ± 10.1 $r=$ .76*
EC OR before vs. after insertion $\Delta {\text{EC}\hspace{1em}\text{OR}}_{\text{post}-\text{pre}\hspace{1em}\text{ins}}$	5.5 ± 8.6 $r=$ .62	2.1 ± 14.7 $r=$ .42	6.0 ± 7.0 $r=$ .88***
Preoperative audiogram vs. postinsertion EC OR ${\Delta }_{\text{EC}\hspace{1em}\text{OR}\hspace{1em}\text{post}-\text{Audio}\hspace{1em}\text{pre}}$	52.5 ± 26.7 $r=$ −.10	27.3 ± 20.4 $r=$ .25	14.0 ± 9.4 $r=$ .60
Postoperative audiogram (TSO) vs. postinsertion EC OR ${\Delta }_{\text{EC}\hspace{1em}\text{OR}\hspace{1em}\text{post}-\text{Audio}\hspace{1em}\text{TSO}}$	20.5 ± 32.0 $r=$ −.26	−7.2 ± 22.6 $r=$ .29	−15.5 ± 12.8 $r=$ .40
Postoperative audiogram (FF) vs. postinsertion. EC OR ${\Delta }_{\text{EC}\hspace{1em}\text{OR}\hspace{1em}\text{post}-\text{Audio}\hspace{1em}\text{FF}}$	22.0 ± 39.5 $r=$ −.36	−6.7 ± 30.1 $r=$ −.16	−16.0 ± 16.3 $r=$ .05

Note. OR = ongoing response; EC = extracochlear; FF = first fit; TSO = test switch-on.

^*p < .05 (significant). ***p < .001 (highly significant).