Mortality models
| HR (95% CI) | P value | AIC | |
| PREO | 2.46 (2.07 to 2.92) | <0.001 | 14 194 |
| POSTO | 2.54 (2.15 to 3) | <0.001 | 14 181 |
| Pre-FEV1% | 0.97 (0.96 to 0.97) | <0.001 | 13 837 |
| Post-FEV1% | 0.97 (0.96 to 0.97) | <0.001 | 13 806 |
All regression models included the following covariates: age, sex, race, smoking status, pack per years, history (per questionnaire) of asthma, diabetes, high blood pressure, stroke and sleep apnoea.
AIC , Akaike information criterion; POSTO, postbronchodilator FEV1/FVC <0.7; pre-FEV1%, prebronchodilator FEV1% predicted; post-FEV1%, postbronchodilator FEV1% predicted; PREO, prebronchodilator FEV1/FVC <0.7.