Significance level was set at α = 0.05, p-values between .05 and .075 were reported as marginally significant. 3 Results To investigate driving fatigue, several metrics/indices were employed, encompassing one objective driving-based measure (SDLP, registered by the driving simulator), one objective physiological measure (PERCLOS, recorded with an eye-tracker) and questionnaire-based subjective measures. 3.1 Short-term effects of DST on driving-fatigue The short-term effects of the Spring transition to DST on objective measurements of driving fatigue were analyzed by linear mixed-effects models (LMMs).
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