Time varying Cox proportional hazards analysis
| Variable | Hazard ratio | 95% confidence interval | p value |
|---|---|---|---|
| FEV1 (decreasing) per unit % predicted change | 1.10 | 1.06 to 1.14 | <0.001 |
| Colonisation (present in 1993 or acquired) | 7.92 | 2.65 to 23.69 | <0.001 |
| Age (years) in 1993 (covariate) | 1.08 | 0.99 to 1.18 | 0.08 |