Figure 1.
Histogram of time-points of acquisition.
Participants were recruited in winter semester 2011 and summer semester 2012. Lecture periods within these semesters were 17. Okt.2011-11. Feb.2012 and 16. Apr.2012–21. Jul.2012.
Table 1.
Sleep quality and legal drug consumption before, during and after an exam period.
Figure 2.
PSQI global scores plotted against consumed amounts of alcohol (2a), caffeine (2b), and nicotine (2c), as well as PSQI global scores plotted against perceived stress (2d) within the last week.
Perceived stress and the amount of nicotine consumed were identified as significant predictors of PSQI global score. Alcohol and caffeine did not predict PSQI global score significantly.
Table 2.
Mixed model results: predictors of sleep quality.