Change during follow-up in z-scores for lung function stratified by follow-up smoking status
| Participants (n) | Smoker (n) | ΔzFEV1 | ΔzFVC | ΔzFEV1/FVC |
|---|---|---|---|---|
| Controls (172) | Yes (44) | 0.16±0.65 | 0.37±0.55 | −0.32±0.82 |
| No (128) | 0.23±0.61 | 0.44±0.61 | −0.31±0.82 | |
| Female farmers (94) | Yes (23) | −0.09±0.54* | 0.10±0.80 | −0.27±1.02 |
| No (71) | 0.30±0.81 | 0.25±0.69 | 0.01±0.93 | |
| Male farmers (865) | Yes (262) | 0.02±0.66** | 0.25±0.68 | −0.35±0.85** |
| No (603) | 0.22±0.65 | 0.33±0.69 | −0.16±0.81 |
All values shown as mean±SD.
*p≤0.015, **p≤0.001 (Mann-Whitney within group comparison between smokers and non-smokers).
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.