Table 4.
Asbestos-exposed workers without radiological evidence of parenchymal disease stratified by smoking status.
| Non-smokers | Smokers | ||||||
|---|---|---|---|---|---|---|---|
| Studie | n | % predicted | SD | n | % predicted | SD | |
| Hall 1982 | FEV1 | 46 | 101.0 | 13.6 | 67 | 92.5 | 14.9 |
| FVC | 102.2 | 11.6 | 99.2 | 13.4 | |||
| Neri 1996 | FEV1 | 34 | 90.9 | 15.6 | 47 | 92.0 | 14.0 |
| FVC | 89.7 | 14.9 | 90.9 | 14.3 | |||
| FEV1/FVC | 100.3 | 10.9 | 100.2 | 6.8 | |||
| Oldenburg 2001 | FEV1 | 12 | 105.7 | 13.6 | 31 | 83.6 | 25.1 |
| FVC | 96.1 | 10.9 | 86.7 | 12.6 | |||
| FEV1/FVC | 102.3 | 4.39 | 94.5 | 18.6 | |||
Differences in forced vital capacity (FVC), forced expiratory volume in the first second (FEV1) and the ratio of both parameters (FEV1/FVC) between asbestos exposed non-smokers and smokers without radiological evidence of asbestosis. Estimates expressed as percent predicted together with standard deviation (SD) and I2 as a measure of heterogeneity, n = number of subjects included in each subgroup.