Maximum stimulation intensity (mA)	Pupil reactivity	Generated PPI score
10	Pupil dilation is greater than 13% during 10-mA stimulation	9
20	Pupil dilation is greater than 13% during 20-mA stimulation	8
30	Pupil dilation is greater than 13% during 30-mA stimulation	7
40	Pupil dilation is greater than 13% during 40-mA stimulation	6
50	Pupil dilation is greater than 13% during 50-mA stimulation	5
60	Pupil dilation is greater than 13% during 60-mA stimulation	4
60	Pupil dilation is greater than 13% during the second 60-mA stimulation	3
60 (5% < dilation < 13%)	Pupil dilation is greater than 13% during the third 60-mA stimulation	2
60 (dilation ≤ 5%)	Pupil dilation is greater than 13% during the last 60-mA stimulation	1
Note: if the pupil dilation is over 20% during stimulation, the PPI score is increased with one point