|  | FEV1 % Predicteda | FVC % Predicteda | ||
---|---|---|---|---|---|
 |  | Estimate (95 % CI) | P-value | Estimate (95 % CI) | P-value |
Age < 40 | Low | −0.82 (−2.01, 0.37) | 0.18 | −1.34 (−2.58, −0.10) | 0.03 |
 | Intermediate | −0.58 (–1.25, 0.09) | 0.09 | −0.77 (−1.47, −0.08) | 0.03 |
 | High | Reference | . | Reference | . |
 | Trend test p-value |  | 0.08 |  | 0.01 |
Age 40 – 64 | Low | −1.85 (−3.05, −0.66) | <0.01 | −2.23 (−3.39, −1.08) | <0.01 |
 | Intermediate | −0.64 (−1.77, 0.49) | 0.27 | −0.81 (−1.91, 0.28) | 0.14 |
 | High | Reference | . | Reference | . |
 | Trend test p-value |  | <0.01 |  | <0.01 |
Age ≥ 65 | Low | −4.76 (−7.33, −2.20) | <0.01 | −5.50 (−7.60, −3.40) | <0.01 |
 | Intermediate | −1.65 (−4.39, 1.09) | 0.24 | −1.42 (−3.67, 0.82) | 0.21 |
 | High | Reference | . | Reference | . |
 | Trend test p-value |  | <0.01 |  | <0.01 |