One way ANOVA and mean (SD) FEV1, FVC, and FEV1/FVC before and after reversibility test by all combinations of pre- and post-bronchodilator defined COPD in a general adult population in 1996–7
| Pre- and post-bronchodilator FEV1/FVC ⩾0.7(N = 2010) | Pre- and post-bronchodilator FEV1/FVC <0.7(N = 145) | Pre-bronchodilator FEV1/FVC <0.7 and post-bronchodilator FEV1/FVC ⩾0.7 (N = 69) | Pre-bronchodilator FEV1/FVC ⩾0.7 and post-bronchodilator FEV1/FVC <0.7(N = 11) | p values(one way ANOVA) | |
|---|---|---|---|---|---|
| Values are shown as mean (SD). | |||||
| Pre-bronchodilator FEV1 | 3.32 (0.89) | 2.14 (0.86) | 2.83 (1.02) | 2.71 (0.77) | <0.001 |
| Pre-bronchodilator FVC | 4.16 (1.10) | 3.41 (1.21) | 4.12 (1.46) | 3.64 (1.05) | <0.001 |
| Pre-bronchodilator FEV1/FVC | 0.80 (0.05) | 0.62 (0.07 | 0.68 (0.02) | 0.75 (0.08) | <0.001 |
| Post-bronchodilator FEV1 | 3.39 (0.91) | 2.26 (0.88) | 3.03 (1.06) | 2.66 (0.75) | <0.001 |
| Post-bronchodilator FVC | 4.15 (1.10) | 3.55 (1.19) | 4.17 (1.44) | 3.91 (1.08) | <0.001 |
| Post-bronchodilator FEV1/FVC | 0.82 (0.05) | 0.63 (0.07) | 0.72 (0.02) | 0.68 (0.03) | <0.001 |