Table 3

The association between gender and FEV1% predicted in subjects with chronic obstructive pulmonary disease (COPD), with regression coefficients (β) and p values for female gender and for the interaction between gender and smoking

β (95% CI)p Valueβ (95% CI)p Value
All subjects with COPD948−0.2 (−2.5 to 2.1)0.8650.2 (0.02 to 0.3)0.027
Early onset, age <60315−3.8 (−7.6 to 0.1)0.0570.3 (0.1 to 0.6)0.014
Low exposure, <20 pack-years239−5.7 (−10.2 to −1.3)0.0120.8 (−0.1 to 1.8)0.066
  • * Basic model with no interaction term, adjusted for pack-years, self-reported asthma and educational level.

  • Gender×pack-years interaction terms are included in the basic models.

  • Educational level was missing for five subjects with COPD; asthma history was missing for one subject with COPD.

  • FEV1, forced expiratory volume in 1 s.