Table 4.

Summary of hierarchical linear model for intelligibility with processing speed (PS) as a predictor.

Fixed effect	Coeff.	Std. error	T-ratio	d.f	P-value
STEP 1
For Intercept
Intercept	0.626	0.020	30.675	26	<0.001
PS	0.008	0.034	0.246	26	0.808
For Slope
Fidelity index	1.029	0.033	30.624	26	<0.001
PS	−0.022	0.044	−0.503	26	0.619
STEP 2
For Intercept
Intercept	0.763	0.038	20.001	25	<0.001
PS	−0.003	0.029	−0.110	25	0.914
PTA	−0.003	0.001	−3.948	25	0.001
For Slope
Fidelity index	0.946	0.072	13.105	25	<0.001
PS	−0.015	0.043	−0.353	25	0.726
PTA	0.002	0.001	1.523	25	0.140
STEP 3
For Intercept
Intercept	0.951	0.10	8.671	24	<0.001
PS	−0.001	0.027	−0.040	24	0.969
PTA	−0.003	0.001	−5.637	24	<0.001
Age	−0.003	0.001	−1.755	24	0.092
For Slope
Fidelity index	0.886	0.190	4.665	24	<0.001
PS	−0.016	0.043	−0.371	24	0.713
PTA	0.002	0.001	1.548	24	0.134
Age	0.001	0.002	0.338	24	0.738

Amount of hearing loss (PTA) is average of thresholds at 1, 2, 3, and 4 kHz in the test ear.