Examining the relationship between speech intensity and self-rated communicative effectiveness in individuals with Parkinson's disease and hypophonia.

Purpose: To examine the relationship between speech intensity and self-ratings of communicative effectiveness in speakers with Parkinson's disease (PD) and hypophonia. An additional purpose was to evaluate if self-ratings of communicative effectiveness made by participants with PD differed from ratings made by primary communication partners.
Methods: Thirty participants with PD and 15 healthy older adults completed the Communication Effectiveness Survey. Thirty primary communication partners rated the communicative effectiveness of his/her partner with PD. Speech intensity was calculated for participants with PD and control participants based on conversational utterances.
Results: Results revealed significant differences between groups in conversational speech intensity (p=.001). Participants with PD self-rated communicative effectiveness significantly lower than control participants (p=.000). Correlational analyses revealed a small but non-significant relationship between speech intensity and communicative effectiveness for participants with PD (r=0.298, p=.110) and control participants (r=0.327, p=.234). Self-ratings of communicative effectiveness made participants with PD was not significantly different than ratings made by primary communication partners (p=.20).
Conclusions: Obtaining information on communicative effectiveness may help to broaden outcome measurement and may aid in the provision of educational strategies. Findings also suggest that communicative effectiveness may be a separate and a distinct construct that cannot necessarily be predicted from the severity of hypophonia.
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