Table 1.
Characteristics of participants and results of assessments.
| PD group (n = 35) | Control group (n = 35) | Between-group comparison | |
|---|---|---|---|
| Age (years), mean ± SD | 66.9 ± 11.2 | 65.4 ± 12.3 | NS |
| Duration of PD (years), mean ± SD | 7.9 ± 3.0 | N/A | N/A |
| Wide Range Achievement Test (WRAT), mean ± SD | 62.8 ± 6.5 | 64.1 ± 7.3 | NS |
| Rey Auditory Verbal Learning Test (RAVLT) trials 1–5 (mean ± SD) | 42.9 ± 7.8 | 46.0 ± 11.5 | NS |
| Beck Depression Inventory (BDI) score (mean ± SD) | 7.0 ± 4.8 | 5.0 ± 7.0 | NS |
| Hearing Handicap Inventory score (mean ± SD) | 18.6 ± 7.5 | 14.1 ± 8.0 | p < 0.03 |
| Pure tone average air conduction hearing threshold (dB HL) in the worst ear ± SD | 33.9 ± 13.0 | 28.9 ± 14.1 | p = 0.13 |
| Words in Noise (WIN) test score, right ear (mean ± SD) | 18.2 ± 5.9 | 19.4 ± 7.6 | NS |
| Words in Noise (WIN) test score, left ear (mean ± SD) | 18.1 ± 6.4 | 19.1 ± 6.3 | NS |
| Staggered-Spondaic-Word (SSW) test, total errors (mean ± SD) | 14.9 ± 12.5 | 14.2 ± 16.9 | NS |
| Masking-Level Difference (MLD) test score (dB), mean ± SD | 10.8 ± 2.2 | 10.1 ± 3.7 | NS |
| Gap in Noise (GIN) detection (msec), mean | 8.9 (right ear) | 8.9 (right ear) | NS |
| 9.6 (left ear) | 9.6 (left ear) | NS | |
| Dichotic Digits Test score (% correct), mean ± SD | 92.7 ± 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 ± 1.7 | 7.5 ± 2.5 | p < 0.08 |
| Spatial release from masking (SRM) test score, 45° condition (mean ± SD) | 8.3 ± 3.0 | 11.2 ± 3.9 | p < 0.002 |
NS, not statistically significant.