Table 5.
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 | 0 (−5.2 to 5.2) | 312.4 (305.4 to 319.5) |
| Per added comorbidity | 5.0 (2.6 to 7.4) | 5.1 (3.2 to 7.1) |
| Per added exacerbation of respiratory symptoms | 6.50 (6.2 to 6.8) | 0.7 (0.1 to 1.3) |
| Sex | ||
| Male | Ref | Ref |
| Female | 7.5 (3.0 to 12.0) | 4.8 (−0.6 to 10.3) |
| Age, per year | 0.0 (−0.4 to 0.4) | 0.1 (−0.4 to 0.6) |
| Smoking habit | ||
| Current smoker | Ref | Ref |
| Ex-smoker | 0.0 (−4.7 to 4.7) | 1.6 (−4.0 to 7.1) |
| Education | ||
| University | Ref | Ref |
| Secondary | 6.5 (1.3 to 11.7) | 3.9 (−2.9 to 10.8) |
| Primary | 8.5 (2.4 to 14.6) | 27.6 (19.9 to 35.4) |
| Constant | −6.5 (−25.4 to 12.4) | −7.0 (−31.5 to 17.5) |
Results from quantile median regression models showing effects of comorbid conditions and exacerbations of respiratory symptoms.
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.