Parameter estimates from generalised estimation equation models# for semi-annual ozone (O3) means, divided in classes (pooled analysis for seasons)
| Increase in: | Parameter estimates for increase (mL·100 days−1) for semi-annual O3 means compared to “46–54 ppb” (summer) or to “28–36 ppb” (winter) |
| FVC summer | |
| 22–<30 ppb | 19.2 (10.6–27.8) |
| 30–<38 ppb | 15.5 (7.0–24.0) |
| 38–<46 ppb | 19.2 (11.1–27.3) |
| FEV1 summer | |
| 22–<30 ppb | 18.5 (9.8–27.1) |
| 30–<38 ppb | 11.6 (3.2–20.1) |
| 38–<46 ppb | 16.8 (8.5–25.0) |
| FVC winter | |
| 4–<12 ppb | −16.4 (−24.6–−8.3) |
| 12–<20 ppb | −15.0 (−21.6–−8.4) |
| 20–<28 ppb | −11.8 (−18.4–−5.3) |
| FEV1 winter | |
| 4–<12 ppb | −10.9 (−19.7–−2.1) |
| 12–<20 ppb | −11.2 (−18.5–−3.9) |
| 20–<28 ppb | −9.9 (−17.4–−2.4) |
Data are presented as parameter estimate (95% confidence intervals)
FVC: forced vital capacity
FEV1: forced expiratory volume in one second
ppb: parts per billion
#: Adjusted for sex, age and height at start of the time period, passive smoke exposure, time period, short-term O3 exposure at start and end of time period