From: Stimulant medication use among Flemish students: results from an exploring secondary data analysis1965-2005
No use
≤ 1×/month
2-3×/month
1×/week
2-6×/week
Daily use
Academic year
79.1%
7.0%
2.3%
0.0%
4.7%
Exam periods
9.3%
23.3%
51.2%
Holiday periods
88.4%