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| Code | Problems | Number of problems (Percentage, %) |
| P3 | Dosing problems | 52 (13.3) |
| P3.1 | Drug dose too low or dosage regime not frequent | 14 (3.6) |
| P3.2 | Drug dose too high or dosage regime too frequent | 33 (8.5) |
| P3.3 | Duration of treatment too short | 4 (1.0) |
| P3.4 | Duration of treatment too long | 1 (0.3) |
