| Responders | Nonresponders | |
| Males | 973 (36) | 255 (38) |
| Age yrs | 47 (35–60) | 36 (27–48) |
| Temperature °C | 36.8 (36.4–37.2) | 36.7 (36.2–37.1) |
| Total clinician-recorded symptom severity score | 26 (22–31) | 27 (23–32) |
| Antibiotic prescription | 1464 (54) | 312 (46) |
| Comorbidity | ||
| Respiratory | 395 (15) | 120 (18) |
| Diabetes | 126 (5) | 12 (2) |
| Cardiovascular | 240 (9) | 26 (4) |
| Discoloured sputum | 1223 (45) | 321 (47) |
| Yellow | 689 (26) | 150 (22) |
| Green | 498 (19) | 159 (23) |
| Blood-stained | 36 (1) | 12 (2) |
| Feeling generally unwell | ||
| No problem | 557 (21) | 151 (22) |
| Mild problem | 803 (30) | 146 (22) |
| Moderate problem | 1036 (39) | 273 (40) |
| Severe problem | 281 (10) | 90 (13) |
| Patients | 2690 | 678 |
Data are presented as n, n (%) or median (interquartile range).