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. 2013 Apr 15;9(4):353–362. doi: 10.5664/jcsm.2588

Figure 4. Digit Symbol Substitution Task (DSST) performance and subjective sleepiness scores (KSS) across three study days.

Figure 4

Performance on the Digit Symbol Substitution Task (DSST) (A) and scores on the Karolinska Sleepiness Scale (KSS) (B) at each time point relative to circadian phase plotted across baseline day and constant routine days 1 and 2. DSST/A: Testing was carried out every 30°/∼120 minutes. KSS/B: Testing was carried out every 15°/∼60 minutes. See legend of Figure 3 for additional information. *Post hoc analysis of Study day × Block interaction, p = 0.007, Partial h2 = 0.22. **Post hoc analysis of Study day × Block interaction, p = 0.006, Partial h2 = 0.24.