Table 1 Individual beliefs about the effect of caffeine consumption
N | Mean | SE | |
|---|---|---|---|
1. Caffeine picks me up when I am feeling tired | 199 | 3.55 | 0.252 |
2. I feel less sleepy after having caffeine | 193 | 3.35 | 0.241 |
3. Caffeine improves my attention | 195 | 3.38 | 0.242 |
4. Caffeine makes me feel more energetic | 198 | 3.54 | 0.252 |
5. Caffeine makes me feel more alert | 197 | 3.53 | 0.252 |
6. Caffeine improves my concentration | 194 | 3.45 | 0.248 |
7. I can work longer if I have caffeine | 194 | 3.25 | 0.233 |
8. Caffeine improves my athletic performance | 194 | 3.23 | 0.232 |
9. Workouts are better after having caffeine | 194 | 3.39 | 0.243 |
10. I can exercise longer if I have caffeine | 197 | 3.10 | 0.221 |
11. Caffeine increases my motivation to work | 194 | 3.36 | 0.239 |
12. Caffeine at any time of day throws off my sleep | 194 | 3.06 | 0.241 |
13. I am easily stressed after having caffeine | 197 | 2.41 | 0.172 |
14. Caffeine makes me feel nervous | 195 | 2.72 | 0.195 |
15. I would be unable to function without caffeine | 194 | 2.53 | 0.182 |
16. Caffeine improves my mood | 194 | 3.47 | 0.249 |