Table 1—

Baseline characteristics by exacerbation status: exacerbators versus nonexacerbators

Number of exacerbationsFrequency of exacerbations
Subjects n93520291286
Sex M %86730.00972740.7
Age yrs65±764±70.0663±764±70.05
Current smokers %52480.648480.9
SGRQ total score42±1750±17<0.000148±1852±150.03
FEV1 % pred55±1549±150.00153±1545±13<0.0001
  • Data are presented as mean±sd unless otherwise stated

  • Mean exacerbation rate in patients with exacerbations >0 and <1.65·yr−1 was 0.9·yr−1, and in patients with exacerbations >1.65·yr−1 was 2.8·yr−1

  • M: male

  • SGRQ: St Georges Respiratory Questionnaire

  • FEV1: forced expiratory volume in one second