| Participant | Age | Increase SPL in noise | Hypophonic | Loudness decay | Breathy | Hoarse |
|---|---|---|---|---|---|---|
| F01 | 78 | N | Moderately | Present | Moderately | Moderately |
| F02 | 74 | Y | Moderately | Present | Mildly | Mildly |
| F03 a | 76 | Y | Normal | Present | Normal | Mildly |
| F04 | 81 | M | Mildly | Not present | Normal | Moderately severe |
| F05 | 61 | Y | Mildly | Present | Normal | Mildly/moderately |
| F06 | 83 | Y | Mildly | Not present | Normal | Mildly |
| F07 | 76 | N | Moderately | Present | Normal | Mildly |
| F08 | 76 | N | Moderately Severe | Present | Normal | Mildly |
| FC09 | 69 | Y | Normal | Not present | Normal | Normal |
| FC10 | 72 | Y | Normal | Not present | Normal | Normal |
| FC11 | 65 | Y | Normal | Not present | Normal | Normal |
| FC12 | 69 | Y | Normal | Not present | Mildly | Normal |
| FC13 | 81 | M | Normal | Not present | Mildly | Mildly |
| FC14 | 72 | Y | Normal | Not present | Mildly | Mildly |
| FC15 | 64 | Y | Normal | Not present | Normal | Normal |
| FC16 | 62 | N | Normal | Not present | Normal | Normal |
| FC17 | 64 | Y | Normal | Not present | Mildly | Moderately |
| FC18 | 61 | Y | Normal | Not present | Normal | Normal |
| M01 | 68 | Y | Mildly | Not present | Normal | Normal |
| M02 | 79 | M | Mildly | Not present | Mildly | Mildly |
| M03 | 47 | N | Mildly | Not present | Normal | Mildly |
| M04 | 68 | N | Mildly | Not present | Mildly | Normal |
| M05 | 76 | N | Moderately | Present | Moderately | Mildly |
| M06 | 66 | N | Moderately | Present | Moderately severe | Moderately |
| M07 | 81 | N | Mildly | Did not assess | Mildly | Mildly |
| M08 | 68 | Y | Moderately | Present | Mildly | Mildly |
| M09 | 74 | N | Normal | Present | Normal | Mildly |
| M10 | 69 | N | Mildly | Present | Normal | Mildly/moderately |
| M11 | 60 | Y | Moderately | Present | Moderately severe | Moderately |
| M12 | 71 | Y | Mildly | Present | Mildly | Moderately |
| M13 a | 62 | N | Mildly | Did not assess | Mildly | Mildly |
| M14 | 72 | Y | Moderately | Present | Mildly | Moderately |
| M15 | 86 | Y | Mildly | Did not assess | Mildly | Normal |
| M16 | 69 | N | Moderately | Present | Moderately | Mildly |
| M17 | 74 | N | Moderately | Present | Normal | Moderately |
| M18 | 73 | M | Moderately | Present | Mildly/moderately | Moderately |
| M19 | 37 | M | Severely | Present | Mildly | Normal |
| M20 | 71 | M | Moderately | Present | Normal | Moderately |
| M21 a | 73 | Y | Moderately | Present | Normal | Normal |
| M22 | 73 | M | Mildly | Present | Normal | Mildly |
| M23 | 67 | Y | Moderately | Present | Moderately | Mildly |
| M24 | 59 | N | Mildly | Not present | Normal | Mildly |
| M25 | 74 | Y | Mildly | Present | Normal | Mildly |
| M26 | 81 | Y | Mildly | Present | Mildly | Moderately |
| M27 | 62 | N | Moderately | Present | Moderately | Mildly |
| M28 | 59 | M | Mildly | Not present | Normal | Mildly |
| M29 | 69 | M | Mildly | Not present | Normal | Mildly |
| M30 | 73 | N | Moderately | Present | Moderately | Mildly |
| M31 | 81 | N | Mildly | Present | Normal | Moderately |
| M32 a | 56 | Y | Mildly | Present | Mildly | Moderately |
| M33 | 76 | Y | Mildly | Not present | Moderately | Moderately |
| M34 | 68 | Y | Mildly | Not present | Mildly | Mildly |
| MC35 | 61 | Y | Normal | Not present | Mildly | Mildly |
| MC36 | 69 | Y | Normal | Not present | Mildly | Mildly |
| MC37 | 63 | N | Normal | Not present | Normal | Mildly |
| MC38 | 76 | N | Normal | Not present | Normal | Mildly |
| MC39 | 72 | Y | Normal | Not present | Mildly | Mildly |
| MC40 | 78 | Y | Normal | Not present | Normal | Normal |
| MC41 | 77 | Y | Normal | Not present | Mildly | Mildly |
| MC42 | 66 | Y | Normal | Not present | Normal | Mildly |
| MC43 | 76 | N | Normal | Not present | Normal | Mildly |
| MC44 | 60 | Y | Normal | Not present | Normal | Normal |
Note. The Darley, Aronson, & Brown-based (1969b) rating scale assessed characteristics typically observed in individuals with Parkinson's disease and pertinent to the present study along with participant age and whether the participant's sound pressure level increased in the speech-in-noise condition. Participants F01-F10 and M01-M34 have a diagnosis of PD. Participants FC09-FC18 and MC35-MC44 are neurologically normal. SPL = sound pressure level; Y = yes; N = no; M = data missing due to measurement issues in one of the conditions.
a
Indicates placement of deep-brain stimulation (DBS) device.