Table 1.

Japan Coma Scale for Grading Impaired Consciousness^*

Grade	Consciousness Level
1‐digit code	The patient is awake without any stimuli, and is:
1	Almost fully conscious
2	Unable to recognize time, place, and person
3	Unable to recall name or date of birth
2‐digit code	The patient can be aroused (then reverts to previous state after cessation of stimulation):
10	By easily by being spoken to (or is responsive with purposeful movements, phrases, or words)*
20	With a loud voice or shaking of shoulders (or is almost always responsive to very simple words like yes or no or to movements)
30	Only by repeated mechanical stimuli
3‐digit code	The patient cannot be aroused with any forceful mechanical stimuli, and:
100	Responds with movements to avoid the stimulus
200	Responds with slight movements, including decerebrate and decorticate posture
300	Does not respond at all except for changes in respiratory rhythm

^*”R” and “I” are added to the grade to indicate restlessness and incontinence of urine and feces, respectively: for example; 100‐R and 30‐RI.

^*Criteria in parentheses are used in patients who cannot open their eyes for any reason.