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. 2019 Sep 5;2019(9):CD001869. doi: 10.1002/14651858.CD001869.pub9

3. Yanagihara Scale.

Mode Degree of paralysis
  4
normal
3
slight
2
moderate
1
severe
0
total
At rest          
Wrinkle forehead          
Blink          
Normal closure of eye          
Forced closure of eye          
Closure of eye on involved side          
Wrinkle nose          
Whistle          
Grin          
Depress lower lip/ blow out cheek          

10 separate categories of function, each scored 0 (total paralysis) to 4 (normal), then summed, giving a total score from 0 (total paralysis) to 40 (normal function) (Yanagihara 1977).