Multivariate linear regression analysis for predictors of lung function among male textile workers (n=372), Karachi, Pakistan
| Percentage-predicted FEV1 | Percentage-predicted FVC | Percentage-predicted FEV1/FVC | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Variable | Value (%) | SE | 95% CI | Value (%) | SE | 95% CI | Value (%) | SE | 95% CI |
| Duration of work | −0.5 | 0.1 | (−0.9 to −0.2) | −0.3 | 0.1 | (−0.6 to 0.06) | −0.29 | 0.1 | (−0.5 to −0.07) |
| Pack-years of smoking | 0.009 | 0.16 | (−0.3 to 0.3) | 0.3 | 0.1 | (−0.000 to 0.6) | −0.2 | 0.09 | (−0.4 to 0.02) |
| Educational status | |||||||||
| Educated | – | – | |||||||
| Uneducated | −5.3 | 3.0 | (−11.4 to 0.7) | −4.6 | 2.9 | (−10.4 to 1.1) | −1.1 | 1.8 | (−4.8 to 2.5) |
| Section of mill | |||||||||
| Weaving | – | – | |||||||
| Spinning | 0.6 | 2.7 | (−4.8 to 6.1) | 0.3 | 2.6 | (−4.8 to 5.6) | 0.2 | 1.6 | (−3.1 to 3.5) |
For each of the three lung function indices, the multivariate model included all the variables listed in the table. Marital status, household income per person, mill cluster and ethnicity were excluded, as they became insignificant in the final multivariate models.
R2 values: FEV1=8.5%, FVC=4.7%, Ratio=10.6%.
FEV1: Forced Expiratory Volume in the first second; FVC: Forced Vital Capacity.