Table 1.

Vibratory features were rated on the basis of feature definitions and scale levels.

Feature	Definition	Rating scale	Range
Mucosal wave	Vocal fold deformation along the lateral plane during the opening phase	75-point visual analog scale in % with six anchoring points	15 percentage points
		Absent 20% 35% 50% 65% ≥80%
Amplitude	Maximum lateral excursion of each vocal fold from most medial position	75-point visual analog scale in % with six anchoring points	15 percentage points
		Absent 20% 35% 50% 65% ≥80%
Left-Right phase asymmetry	Phase difference between left and right vocal fold vibration	100-point visual analog scale with four anchoring points	33 points
		Absent: Left and right vocal folds reach both maximal amplitude and the midline at the same time.
		Mild: One vocal fold lags slightly behind the other either during the lateral-to-medial or medial-to-lateral transition.
		Moderate: One vocal fold has already transitioned and begun to move medially before the other vocal fold has hit maximal amplitude.
		Severe: One vocal fold has hit midline while the other vocal fold is at maximal amplitude.
Synchronicity	Continuity of the images within the simulated cycle	3-point scale	1 point
		Completely synchronous: Continuous movement showing the expected phases of vocal fold vibration is present for the entire recording.
		Intermittently asynchronous: Continuous movement is appreciable at times, but there are one or more instances of asynchronicity noted.
		Completely asynchronous: Continuous movement is not appreciable.
Vocal fold edge	Irregularity of the vibrating vocal fold edges	100-point visual analog scale with four anchoring points	33 points
		Regular: Vocal fold edge is straight with a sharp superior edge.
		Mildly irregular: Vocal fold edge may be rounded or a mild swelling may be present. A sulcus may be present on the medial edge of the fold. Glottal closure may still be complete or a small anterior or posterior gap may be present.
		Moderately irregular: Vocal fold edge is clearly nonlinear, but does not impede the vibratory function of the contralateral fold. Glottal closure may form an hourglass configuration.
		Severely irregular: Vocal fold edge is nonlinear with a large protrusion or multiple areas of irregularity. The lesion may impede the vibratory function of the contralateral fold.