Table 1: Characteristics of participants and results of assessments.

PD group ()Control group ()Between-group comparison

Age (years), mean ± SD66.9 ± 11.265.4 ± 12.3NS
Duration of PD (years), mean ± SD7.9 ± 3.0N/AN/A
Wide Range Achievement Test (WRAT), mean ± SD62.8 ± 6.564.1 ± 7.3NS
Rey Auditory Verbal Learning Test (RAVLT) trials 1–5 (mean ± SD)42.9 ± 7.846.0 ± 11.5NS
Beck Depression Inventory (BDI) score (mean ± SD)7.0 ± 4.85.0 ± 7.0NS
Hearing Handicap Inventory score (mean ± SD)18.6 ± 7.514.1 ± 8.0
Pure tone average air conduction hearing threshold (dB HL) in the worst ear ± SD33.9 ± 13.028.9 ± 14.1
Words in Noise (WIN) test score, right ear (mean ± SD)18.2 ± 5.919.4 ± 7.6NS
Words in Noise (WIN) test score, left ear (mean ± SD)18.1 ± 6.419.1 ± 6.3NS
Staggered-Spondaic-Word (SSW) test, total errors (mean ± SD)14.9 ± 12.514.2 ± 16.9NS
Masking-Level Difference (MLD) test score (dB), mean ± SD10.8 ± 2.2 10.1 ± 3.7NS
Gap in Noise (GIN) detection (msec), mean8.9 (right ear)8.9 (right ear)NS
9.6 (left ear)9.6 (left ear)NS
Dichotic Digits Test score (% correct), mean ± SD92.7 ± 6.9 (right) 88.2 ± 12.3 (right)NS
85.6 ± 13.8 (left)84.3 ± 13.2 (left)NS
Spatial release from masking (SRM) test score, 0° condition (mean ± SD)6.6 ± 1.77.5 ± 2.5
Spatial release from masking (SRM) test score, 45° condition (mean ± SD)8.3 ± 3.011.2 ± 3.9

NS, not statistically significant.