Mean annual decline2-150 in FEV0.75 during the first 15 years by smoking status and baseline tertile of FEV0.75 2-151
| Quitters2-152 | Continuous | ||||||
|---|---|---|---|---|---|---|---|
| Tertile of baseline FEV0.75 | n | Baseline (ml)2-153 | Decline (ml/year)2-150 | n | Baseline (ml)2-153 | Decline (ml/year)2-150 | |
| Low | 111 | 2565 | –48.4 | 152 | 2662 | –62.9 | |
| Middle | 129 | 3259 | –51.7 | 123 | 3253 | –65.0 | |
| High | 116 | 3805 | –57.6 | 101 | 3806 | –67.2 | |
↵2-150 Adjusted for age; p<0.001 for smoking, p=0.044 for tertile of baseline FEV0.75, p=0.003 for age, p= 0.018 for duration of smoking, p=0.765 for smoking2-150tertile of FEV0.75 (all ANCOVA).
↵2-151 Tertile limits are <3019 ml, 3019–3478 ml, and >3478 ml achieved by dividing height adjusted baseline FEV0.75 values of 1007 study subjects into three tertiles.
↵2-152 Including baseline past smokers and permanent quitters.
↵2-153 At baseline, adjusted for age and height.