A Bidimensional System of Facial Movement Analysis Conception and Reliability in Adults

Table 1

Distances covered and symmetry ratios (first analysis of the first video, mean of 3 raters, and 10 patients).

Muscles	Side	Mean distance (cm)	Standard deviation (cm)	20% distance (cm)	Minimum (cm)	Maximum (cm)	Symmetry ratio (%)
Frontalis	R; L	1.32; 1.36	0.26; 0.28	0.26; 0.27	0.59; 0.66	1.77; 1.87	97
Orbicularis oculi	R; L	0.42; 0.40	0.16; 0.14	0.08; 0.08	0.07; 0.13	0.70; 0.64	95
Corrugator	R; L	1.07; 1.08	0.15; 0.15	0.21; 0.22	0.80; 0.80	1.32; 1.36	99
Zygomaticus	R; L	0.88; 0.73	0.17; 0.17	0.18; 0.15	0.57; 0.49	1.23; 1.10	83
Orbicularis oris	R; L	0.56; 0.48	0.21; 0.25	0.11; 0.10	0.14; 0.08	1.04; 1.25	86
Buccinator	R; L	0.70; 0.87	0.29; 0.29	0.14; 0.17	0.25; 0.32	1.26; 1.53	80

Each number in Column 3 indicates the mean distance covered during displacement due to maximal contraction of the muscle indicated in Column 1. R: right; L: left. Note that the 20% difference selected to represent disagreement is lower than or equal to the standard deviation for all muscles except for corrugator.