Adjusted mean (95% CI) of lung function indices in control group and exposure groups
| Control group(n = 211) | Low exposure(n = 238) | Moderate exposure(n = 237) | High exposure(n = 237) | |
|---|---|---|---|---|
| *p<0.05, **p<0.01 v control group. | ||||
| †Mean (95% CI) adjusted for sex, age (<30, 30–34, 35–39, and ⩾40 years), height (<164, 164–167, 168–171, and ⩾172 cm) and cigarette-years of smoking (0, 1–99, 100–199, 200–299 and ⩾300). | ||||
| ‡p<0.01, linear trend test across control group to high exposure group. | ||||
| FVC (l)†‡ | 5.06 (4.93 to 5.19) | 4.84 (4.72 to 4.96)* | 4.73 (4.60 to 4.84)** | 4.74 (4.62 to 4.86)** |
| FEV1 (l)†‡ | 4.27 (4.15 to 4.40) | 4.04 (3.92 to 4.16)** | 3.89 (3.76 to 4.00)** | 3.85 (3.73 to 3.97)** |
| FEV1/FVC (%)†‡ | 84.39 (83.00 to 85.77) | 83.23 (81.93 to 84.53) | 82.02 (80.70 to 83.35)* | 80.12 (78.79 to 81.44)** |
| FEV1 (% pred)†‡ | 101.60 (98.60 to 104.60) | 95.50 (92.68 to 98.32)** | 92.22 (89.34 to 95.10)** | 92.22 (89.44 to 95.09)** |