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Problems Related to Caffeine Use
| N (%) | |
|---|---|
| Time devoted | 42 (35.0) |
| Use despite harm | 38 (31.7) |
| Use more or longer than intended | 23 (19.2) |
| Withdrawal | 21 (17.5) |
| Tolerance | 17 (14.2) |
| Unsuccessful quit attempt | 3 (2.5) |
| Important activities given up or reduced | 1 (0.8) |
