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Diary symptoms duration in days until a slight problem or less (centile distribution).
| Symptom | 10th centile | 25th centile | 50th centile | 75th centile | 90th centile |
|---|---|---|---|---|---|
| Cough | 5 | 7 | 11 | 17 | 21 |
| Dyspnoea | 0 | 1 | 5 | 10 | 16 |
| Sputum production | 1 | 5 | 8 | 14 | 20 |
| Sleep disturbance | 1 | 4 | 7 | 12 | 16 |
| Activities restriction | 1 | 4 | 7 | 12 | 18 |
| Unwell | 3 | 5 | 8 | 12 | 18 |
| Any symptom | 5 | 7 | 12 | 18 | 21 |
