Table 4.
Annual days of lost productivity in a general population and in a hospital population
| Covariate | Population-recruited COPD cases and controls (N=160); (95% CI) | Hospital recruited COPD cases and population-recruited controls (N=209); (95% CI) |
|---|---|---|
| COPD status | ||
| No COPD | Ref | Ref |
| COPD, FEV1 <80% of predicted | 5.8 (1.4 to 10.1) | 330.6 (327.8 to 333.3) |
| Sex | ||
| Male | Ref | Ref |
| Female | 9.5 (5.7 to 13.3) | 8.3 (5.9 to 10.6) |
| Age, per year | 0.06 (−0.24 to 0.37) | 0.17 (−0.03 to 0.37) |
| Smoking habit | ||
| Current smoker | Ref | Ref |
| Ex-smoker | 0.8 (−3.3 to 5.0) | 1.0 (−1.5 to 3.4) |
| Education | ||
| University | Ref | Ref |
| Secondary | 4.23 (−0.3 to 8.8) | 5.0 (2.0 to 8.0) |
| Primary | 6.2 (1.0 to 11.5) | 25.5 (22.1 to 28.9) |
| Constant | −4.22 (−20.7 to 12.2) | −10.0 (−20.7 to 0.6) |
Results from quantile median regression models.
COPD, here defined by FEV1/FVC<0.7 postbronchodilation and FEV1 <80% of predicted values.
COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.