Figure 2

Grades and scores corrected for previous performance. Average grades of non-users (white bars), moderate users (grey bars) and intensive users (black bars) during on the final exam of students with “below average” (A.) “average” (B.) and “above average” (C.) historical grades. Data are presented as means ± SEM. *p < 0.05 compared to non-users, ^#p < 0.05 compared to moderate users.