Nonlinear analysis by phase space reconstruction of healthy elderly voices.
Luana Alves Fernandes, Viviane Cristina de Castro Marino, Evelyn Alves Spazzapan and 5 others
PMID 37377326WHAT IT FOUND
Healthy elderly voices all showed four or more curves, but men had worse irregularity and spacing than women.
These non-linear voice patterns differed by sex.
Key findings
01Elderly voices without vocal complaints all showed four or more curves in the voice graph.
02Male elderly voices had higher irregularity grades than female elderly voices.
03Male elderly voices had more medium to large spacing than female elderly voices.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
Only 29 participants were studied. None had a laryngeal examination, so structural vocal-fold health was not confirmed. The inter-judge agreement was 0.91 for curves and 0.49 for irregularity, and a fourth judge had to resolve disagreements. The CIE protocol is not fully standardized across terminology, measurement, and grading. There were no comparison studies of healthy elderly voices using this method.
The easy way to misread this
Do not conclude that elderly men have clinically worse voices or that this analysis can diagnose voice disorders. The study included only people with no vocal complaints and perceptual voice grades of 0 or 1, and it did not include laryngeal examination or patients with pathology.