Table 2

Exacerbation characteristics

CharacteristicMean±SD or N (%)
Exacerbations/patient/year, symptom based2.5±1.8
Exacerbations/patient/year, event based2.5±1.3
Exacerbation distribution (symptom based)
 0 exacerbations4 (12.1)
 1 exacerbation4 (12.1)
 2 exacerbations14 (42.4)
 3 or more exacerbations11 (33.33)
Exacerbation signs and symptoms (symptom-based exacerbations, % of all events, n=81)
 Dyspnoea73 (90.1)
 Fatigue72 (88.9)
 Increased sputum52 (64.2)
 Increased cough47 (58)
 Changes in sputum colour38 (46.9)
 Wheezing36 (44.4)
 Symptoms of cold or influenza28 (34.5)
 Chest tightness26 (32.1)
 Fever9 (11.1)
Exacerbation total recovery time, days13.28±13.34
Treated recovery time, days10.35±10.46