Table 1

Baseline characteristics of participants and non-participants registered by GPs.

Participantsa (n = 358), %Non-participants (n = 324), %
Median age, years5052
Sex, male4740
Current smoker4336
Former smoker1715
Influenza immunisation1310
Pneumococcal immunisation45
Chronic obstructive pulmonary disease1116
Any underlying disease3440
Sputum production7169
Tachypnoea (respiratory rate >20/min)1413
Tachycardia (heart rate >100/min)105
Temperature >37.5°C4342
Abnormal auscultation3738
Diagnosis, pneumonia3531
Diagnosis, acute bronchitis5450
Diagnosis, acute exacerbation of chronic obstructive pulmonary disease913
Antibiotic treatment initiated5674
  • a For six participants, GPs' data were missing.