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Rate of Decline of FEV1 According to Quartiles of Initial FEV1 Values at Enrollment
| FEV1 Values (% Predicted) | No. of Patients | No. of Patients With at Least 2 PFTs | FEV1 Decline Rate (mL/y) | SE |
|---|---|---|---|---|
| > 70% | 106 | 100 | 88.3 | 9.2 |
| 51%-70% | 50 | 42 | 92.7 | 14.8 |
| 36%-50% | 42 | 33 | 85.5 | 16.4 |
| ≤ 35% | 17 | 13 | 85.4 | 33.2 |
There was no statistically significant difference in the rate of decline of FEV1 after dividing patients into different categories based on their initial FEV1 (P = .99). PFT = pulmonary function test.
