|
Positive effects
|
Medical users (N=254)
|
Misusers (N=441)
|
p-valueb
|
|---|
| |
n (%)
|
95%CI
a
|
n (%)
|
95%CI†
| |
|---|
|
Improved concentration
|
231 (95.9)
|
92.5-98.0
|
364 (89.0)
|
85.6-91.9
|
0.002
|
|
Stay awake / study longer
|
82 (34.0)
|
28.1-40.4
|
235 (57.5)
|
52.5-62.3
|
<0.0001
|
|
Motivation to study
|
115 (47.7)
|
41.3-54.2
|
205 (50.1)
|
45.3-55.0
|
0.6
|
|
More energy
|
92 (38.2)
|
32.0-44.6
|
204 (49.9)
|
45.0-54.7
|
0.004
|
|
Improved results
|
133 (55.2)
|
48.7-61.6
|
170 (41.6)
|
36.7-46.5
|
0.0008
|
|
Sport performance
|
16 (6.6)
|
3.8-10.§
|
14 (3.4)
|
1.9-5.7
|
0.06
|
|
Other
|
44 (17.4)
|
12.3-22.6
|
46 (10.6)
|
7.8-13.8
|
0.01
|
- a95%CI: Clopper-Pearson confidence interval
- bChi-square test
