Table 2

Changes over time in the frequency of symptoms reported at exacerbation

SymptomStarting value %Annual change %·yr−195% CIp‐value
Dyspnoea601.30−1.7–4.30.383
Sputum purulence174.121.4–6.80.004
Sputum volume345.252.2–8.20.001
Cold#31−1.77−3.7–0.020.073
Wheeze38−2.87−4.7–−1.00.004
Sore throat13−0.38−1.7–0.90.556
Cough30−0.81−2.3–0.70.281
  • The starting value estimates the percentage of exacerbations with a particular symptom had they all occurred at the start of the study and the annual change gives how this percentage changed over time

  • CI: confidence interval

  • #: nasal congestion/discharge