Table 6
Multivariate regression analysis to examine job categories, age and smoking as a predictors of lung function
| Covariates | Dependent | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| VC | FVC | FEV1 | |||||||||
| β | SE | p Value | β | SE | p Value | β | SE | p Value | |||
| Intercept | 3.703 | 0.182 | 0.000 | 3.841 | 0.203 | 0.000 | 3.563 | 0.197 | 0.000 | ||
| Job 1 (dummy) | 0.362 | 0.174 | 0.039 | 0.145 | 0.194 | 0.456 | −0.023 | 0.188 | 0.903 | ||
| Job 2 (dummy) | 0.515 | 0.154 | 0.001 | 0.497 | 0.172 | 0.004 | −0.252 | 0.167 | 0.133 | ||
| Job 3 (dummy) | 0.508 | 0.145 | 0.001 | 0.567 | 0.162 | 0.001 | 0.219 | 0.157 | 0.165 | ||
| Job 4 (dummy) | 0.028 | 0.131 | 0.831 | 0.136 | 0.147 | 0.360 | −0.367 | 0.143 | 0.011 | ||
| Job 5 (dummy) | 0.319 | 0.172 | 0.066 | 0.288 | 0.193 | 0.137 | 0.212 | 0.187 | 0.282 | ||
| Job 6 (dummy) | −0.11 | 0.161 | 0.513 | −0.121 | 0.180 | 0.505 | −0.376 | 0.175 | 0.033 | ||
| Age | −0.017 | 0.005 | 0.001 | −0.020 | 0.006 | 0.001 | −0.024 | 0.006 | 0.000 | ||
| Pack-years | −0.279 | 0.071 | 0.000 | −0.241 | 0.080 | 0.003 | −0.181 | 0.078 | 0.021 | ||
| Intercept | 3.726 | 0.188 | 0.000 | 3.862 | 0.207 | 0.000 | 3.579 | 0.199 | 0.000 | ||
| Job 1 (dummy) | 0.333 | 0.180 | 0.066 | 0.120 | 0.198 | 0.545 | −0.042 | 0.190 | 0.827 | ||
| Job 2 (dummy) | 0.574 | 0.159 | 0.000 | 0.548 | 0.174 | 0.002 | −0.214 | 0.168 | 0.204 | ||
| Job 3 (dummy) | 0.519 | 0.150 | 0.001 | 0.576 | 0.165 | 0.001 | 0.226 | 0.159 | 0.156 | ||
| Job 4 (dummy) | 0.110 | 0.135 | 0.417 | 0.205 | 0.148 | 0.168 | −0.314 | 0.142 | 0.029 | ||
| Job 5 (dummy) | 0.354 | 0.179 | 0.049 | 0.318 | 0.197 | 0.107 | 0.225 | 0.189 | 0.236 | ||
| Job6 (dummy) | −0.112 | 0.167 | 0.505 | −0.126 | 0.184 | 0.495 | −0.380 | 0.177 | 0.033 | ||
| Age | −0.021 | 0.005 | 0.000 | −0.023 | 0.006 | 0.000 | −0.026 | 0.006 | 0.000 | ||
| PEF | FEV1/FVC | FEV1/VC | |||||||||
| Intercept | 482.9 | 45.85 | 0.000 | 95.13 | 4.64 | 0.000 | 98.66 | 4.99 | 0.000 | ||
| Job 1 (dummy) | −155.3 | 43.85 | 0.001 | −7.37 | 4.44 | 0.098 | −12.69 | 4.70 | 0.008 | ||
| Job 2 (dummy) | −146.6 | 38.77 | 0.000 | −20.24 | 3.92 | 0.000 | −20.51 | 4.21 | 0.000 | ||
| Job 3 (dummy) | −129.5 | 36.51 | 0.000 | −8.35 | 3.69 | 0.025 | −6.47 | 3.97 | 0.105 | ||
| Job 4 (dummy) | −160.9 | 33.18 | 0.000 | −15.75 | 3.36 | 0.000 | −12.60 | 3.61 | 0.001 | ||
| Job 5 (dummy) | −58.92 | 43.55 | 0.178 | −2.20 | 4.41 | 0.618 | −2.52 | 4.74 | 0.595 | ||
| Job 6 (dummy) | −176.4 | 40.75 | 0.000 | −10.93 | 4.12 | 0.009 | −10.44 | 4.43 | 0.020 | ||
| Age | −1.419 | 1.288 | 0.272 | −0.191 | 0.130 | 0.144 | −0.268 | 0.14 | 0.057 | ||
| Pack-years | −21.91 | 18.04 | 0.226 | −0.017 | 1.826 | 0.993 | 1.460 | 1.96 | 0.458 | ||
| Intercept | 484.8 | 45.88 | 0.000 | 95.13 | 4.62 | 0.000 | 98.53 | 4.98 | 0.000 | ||
| Job 1 (dummy) | −157.5 | 43.87 | 0.000 | −7.37 | 4.42 | 0.097 | −12.55 | 4.76 | 0.009 | ||
| Job 2 (dummy) | −142.0 | 38.64 | 0.000 | −20.23 | 3.89 | 0.000 | −20.81 | 4.19 | 0.000 | ||
| Job 3 (dummy) | −128.6 | 36.54 | 0.001 | −8.34 | 3.68 | 0.025 | −6.53 | 3.97 | 0.101 | ||
| Job 4 (dummy) | −154.6 | 32.79 | 0.000 | −15.74 | 3.31 | 0.000 | −13.03 | 3.56 | 0.000 | ||
| Job 5 (dummy) | −56.14 | 43.55 | 0.199 | −2.20 | 4.39 | 0.617 | −2.71 | 4.72 | 0.568 | ||
| Job6 (dummy) | −176.8 | 40.79 | 0.000 | −10.93 | 4.11 | 0.009 | −10.41 | 4.43 | 0.020 | ||
| Age | −1.690 | 1.270 | 0.185 | −0.191 | 0.12 | 0.137 | −0.250 | 0.13 | 0.071 | ||
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Job category: 1=bottling plant workers; 2=mechanical workshop workers; 3=continuous casting workers; 4=general workers; 5=furnace workers; 6=rolling mill workers; 7=fabrication workshop workers.
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Job category=1 is reference category, Job1 (dummy)=mechanical workshop workers, Job2 (dummy)=continuous casting workers, Job3 (dummy)=general workers, Job4 (dummy)=furnace workers, Job5 (dummy)=rolling mill workers and Job6 (dummy)=fabrication workers.
