Fig. 3

Average SP (left) and KSS (right) scores (data points) and their standard errors (error bars) as a function of workload metrics computed within 168 h prior to the questionnaire response times (sample 2, N = 263). The fitted functions are shown by the solid blue lines, where the dashed-dotted red and green lines represent, respectively, their upper and lower limits considering a 95% CI. Details in the text.