Supplementary Table 1. Classification criteria for the five-level alertness framework.

Alertness levels	Assigned value	Number of data points	Percentage (%)	Mean reaction time range (ms)
High alertness	0	120	20.00	< 250.05
Higher alertness	1	120	20.00	250.05~273.983
Moderate alertness	2	120	20.00	273.983~294.658
Lower alertness	3	120	20.00	294.658~319.6
Low alertness	4	120	20.00	≥319.6