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