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. 2016 Nov 14;3:100. doi: 10.3389/fvets.2016.00100

Table 2.

Percentages and average number per scorer of “don’t know” responses for each FAU based on a total of 94 images.

Facial action unit Unable to score (%) Average per scorer
Temporal tension 4 3
Forehead profile 17 11
Orbital tightening 2 1
Tension above the eyes 5 3
Cheek tension 11 7
Upper lip contraction 36 21
Lower jaw profile 46 28
Snout angle 18 10
Snout plate changes 27 16
Nostril dilation 72 44