Covariables2-153 | SFEV1/h2(Multiple R2=0.09; RSE2-152=1.0081) | SFVC/h2(Multiple R2=0.04; RSE2-152=0.9825) | ||||||
---|---|---|---|---|---|---|---|---|
Regression coefficient | 95% CI | p value | p value of the interaction term2-154 | Regression coefficient | 95% CI | p value | p value of the interaction term2-154 | |
Constant | 0.5397 | 0.1501 to 0.9293 | 0.6315 | 0.2518 to 1.0112 | ||||
Age | −0.0105 | −0.0203 to −0.0007 | 0.03 | 0.59 | −0.0116 | −0.0210 to −0.0022 | 0.02 | 0.42 |
History of asthma | −0.7095 | −0.8961 to −0.5229 | <0.01 | 0.09 | −0.3988 | −0.5807 to −0.2169 | <0.01 | 0.69 |
Atopy | −0.0300 | −0.1384 to 0.0784 | 0.59 | 0.11 | −0.0543 | −0.1599 to 0.0513 | 0.31 | 0.21 |
Wheezing | −0.2977 | −0.3916 to −0.2038 | <0.01 | 0.52 | −0.1673 | −0.2588 to −0.0758 | <0.01 | 0.42 |
Single marital status | −0.1723 | −0.2781 to −0.0665 | <0.01 | 0.10 | −0.1801 | −0.19 to −0.0770 | <0.01 | 0.84 |
Pack years in cigarette smokers | −0.0139 | −0.0184 to −0.0094 | <0.01 | 0.07 | −0.0080 | −0.0123 to −0.0037 | <0.01 | 0.55 |
Ex−smoker | −0.0635 | −0.1693 to 0.0423 | 0.24 | 0.39 | −0.0599 | −0.1632 to 0.0434 | 0.26 | 0.22 |
Airborne exposures other than quartz | −0.0191 | −0.1710 to 0.1328 | 0.81 | 0.81 | 0.0237 | −0.1243 to 0.1717 | 0.75 | 0.85 |
Years of occupational quartz exposure | −0.0086 | −0.0151 to −0.0021 | 0.01 | −0.0052 | −0.0115 to 0.0011 | 0.10 |
↵2-150 Standardised residuals adjusted for age, body mass and technician (see text).
↵2-151 Includes all quartz exposed subjects after excluding other smokers (n=17) and those with missing information on any of the other covariables.
↵2-152 RSE = residual standard error.
↵2-153 All covariables are dichotomous variables (1 = yes, 0 = no) except for pack years and years of quartz exposure which are continuous variables.
↵2-154 Interaction term between each variable and years of quartz exposure.