Factors associated with exacerbations and all-cause mortality at multivariate analysis
| Factor | OR (95% CI) | P values |
| At least one exacerbation/year | ||
| ACT score | 0.87 (0.82 to 0.93) | 0.000 |
| Number of baseline exacerbations* | 1.28 (1.04 to 1.57) | 0.018 |
| At least three exacerbations/year | ||
| ACT score | 0.93 (0.88 to 0.99) | 0.021 |
| Number of baseline exacerbations* | 1.35 (1.11 to 1.66) | 0.005 |
| All-cause mortality | ||
| Recent FEV1* | 0.30 (0.14 to 0.65) | 0.002 |
*Log transformed because of skewness, interpretation should be done at the log scale. Note: analysis considers only the first year of follow-up.
ACT, Asthma Control Test.