Table 5 Time to first exacerbation (mean months and HRs) (95 % CI) according to baseline IC quartiles
From: Longitudinal inspiratory capacity changes in chronic obstructive pulmonary disease
IC quartile | Tiotropium (n = 2855) | Control (n = 2881) | HR (95 % CI) |
|---|---|---|---|
Q1 (n = 1413) | 14.3 (11.7-17.0) | 10.3 (8.8-11.7) | 0.81 (0.72-0.92) |
Q2 (n = 1427) | 14.7 (12.6-17.6) | 10.5 (8.7-12.2) | 0.83 (0.73-0.94) |
Q3 (n = 1450) | 16.8 (13.6-19.8) | 14.8 (12.2-17.2) | 0.95 (0.83-1.07) |
Q4 (n = 1446) | 20.4 (17.3-23.4) | 15.8 (12.8-18.4) | 0.86 (0.75-0.97) |