Variable | OR (95% CI) | p-value |
Age | 1.012 (1.007–1.017) | 0.000 |
Male sex | 1.103 (0.928–1.309) | 0.265 |
COPD | 2.883 (2.275–3.653) | 0.000 |
Fever | 4.667 (3.813–5.712) | 0.000 |
Cough | 1.058 (0.809–1.384) | 0.679 |
Increase in dyspnoea | 1.390 (1.152–1.677) | 0.001 |
Increase in sputum | 2.369 (1.962–2.860) | 0.000 |
Purulent sputum | 10.068 (8.079–12.521) | 0.000 |
Demand for antibiotics | 3.02 (1.668–5.468) | 0.000 |
Request for a radiograph | 1.602 (1.142–2.247) | 0.006 |
Radiograph positive for consolidation | 8.07 (4.232–15.387) | 0.000 |
CRP level# | ||
<10 mg·L−1 | 0.103 (0.061–0.173) | 0.000 |
10–20 mg·L−1 | 1.488 (0.542–4.08) | 0.440 |
>20 mg·L−1 | 4.6 (2.781–7.606) | 0.000 |
Missing or illegible | 0.396 (0.182–0.859) | 0.019 |
Partial-intervention group¶ | ||
Pre-intervention | 0.574 (0.298–1.104) | 0.096 |
Post-intervention | 0.424 (0.219–0.821) | 0.011 |
Full intervention group¶ | ||
Pre-intervention | 0.811 (0.461–1.426) | 0.466 |
Post-intervention | 0.217 (0.123–0.382) | 0.000 |
COPD: chronic obstructive pulmonary disease; CRP: C-reactive protein. #: compared with no use of CRP; ¶: compared with control group.