Table 2

Days of lost productivity in hospital-recruited COPD cases, population-recruited COPD cases and population-recruited control subjects by gender, smoking status and education

 GenderSmoking statusEducation
MenWomenCurrentExPrimarySecondaryUniversity
Hospital-recruited COPD cases, median (IQR)314 (355)*365 (140.5)318 (353)365 (278)365 (120)*365 (337)16.5 (362)
Population-recruited COPD cases, median (IQR)2.5 (28)*132.5 (365)7 (295)37 (365)4 (365)28 (332)4 (76)
Population-recruited controls, median (IQR)1.5 (8)*8 (32)5 (34)3.5 (14)29 (202.5)5 (16.5)1 (14)
  • COPD, here defined by FEV1/FVC<0.7 postbronchodilation and FEV1 <80% of predicted values.

  • *p<0.05, Kruskal-Wallis test, adjusted for ties.

  • COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.