Table 5.

Interrater agreement and reliability using videostroboscopy and simulated stroboscopy.

Vibratory feature	% Agreement			Spearman	Intraclass correlation
	n agree	% agree	Range	ρ	ICC	95% CI
Videostroboscopy
Left mucosal wave	36/59	61	15 pts	0.72*	0.31	0.10–0.49
Right mucosal wave	36/60	60	15 pts	0.84*	0.55	0.37–0.68
Left amplitude	70/73	96	15 pts	0.84*	0.57	0.41–0.69
Right amplitude	69/72	96	15 pts	0.86*	0.64	0.50–0.74
Left-Right phase asymmetry	48/56	86	33 pts	0.70*	0.33	0.10–0.51
Left vocal fold edge	70/75	93	33 pts	0.75*	0.58	0.42–0.71
Right vocal fold edge	69/75	92	33 pts	0.72*	0.51	0.34–0.64
Simulated stroboscopy
Left mucosal wave	60/74	81	15 pts	0.89*	0.73	0.61–0.81
Right mucosal wave	64/73	88	15 pts	0.89*	0.79	0.69–0.85
Left amplitude	76/77	99	15 pts	0.80*	0.51	0.34–0.64
Right amplitude	78/80	98	15 pts	0.79*	0.62	0.48–0.72
Left-Right phase asymmetry	58/70	83	33 pts	0.73*	0.35	0.12–0.50
Left vocal fold edge	78/79	99	33 pts	0.79*	0.55	0.39–0.67
Right vocal fold edge	76/78	97	33 pts	0.86*	0.52	0.35–0.65

Note. Agreement is reported as the number and percentage of direct agreement within the range of one level of the feature-specific scale. Reliability is reported by Spearman correlations, which are statistically significant at p < .0001 (*), and the intraclass correlation (ICC) as well as the 95% confidence interval (CI) for the ICC. pts = points.