Progression of Voice and Speech Impairment in the Course of Parkinson's Disease: A Longitudinal Study

Table 2

Perceptual speech score and intelligibility score.

Speech modality		Definition
Voice	0	Normal
	1	Voice quality slightly hoarse, slightly reduced loudness, intermittently present
	2	Voice quality hoarse or tremulous, slightly reduced loudness, continuously present
	3	Voice quality hoarse or tremulous, markedly reduced loudness
	4	Marked reduction of voice quality, whispery or scratchy voice
Articulation	0	Normal articulation
	1	Slightly reduced articulatory accuracy, intermittently present
	2	Slightly reduced articulatory accuracy, continuously present
	3	Markedly reduced articulatory accuracy, slightly reduced intelligibility
	4	Markedly reduced intelligibility
Tempo/fluency	0	Normal speech tempo and distribution of speech pauses
	1	Slightly reduced or accelerated speech tempo, intermittently present
	2	Rushes of speech and prolonged pauses, not very pronounced or only intermittently present; or slightly reduced speech tempo
	3	Rushes of speech and prolonged pauses, very pronounced, or continuously present; or markedly reduced speech tempo
	4	Palilalia
Prosody	0	Normal pitch variability
	1	Slightly monotone
	2	Extremely monotone
Intelligibility score	0	Good intelligibility
	1	Fair intelligibility
	2	Moderately impaired intelligibility
	3	Poor intelligibility