Table 4

Multivariate regression analysis to examine job type, age, and smoking as a predictors of lung function

Covariates		Dependent variables
		VC				FVC				FEV₁
		β	SE			p Value	β			SE	p Value	β	SE	p Value
Intercept	3.552	0.235	0.000		3.795	0.262	0.000		3.465	0.256	0.000
Job type	0.280	0.084	0.000		0.273	0.094	0.004		−0.107	0.091	0.245
Age	−0.014	0.006	0.026		−0.019	0.007	0.007		−0.022	0.007	0.002
Pack-years	0.475	0.460	0.303		0.120	0.511	0.814		0.359	0.500	0.473

Intercept	3.812	0.192	0.000		3.932	0.210	0.000		3.643	0.202	0.000
Job type	0.300	0.087	0.001		0.296	0.095	0.002		−0.096	0.091	0.294
Age	−0.023	0.005	0.000		−0.025	0.006	0.000		−0.027	0.006	0.000
	PEF			FEV₁/FVC			FEV₁/VC
Intercept	437.5	57.72	0.000		93.45	6.006	0.000		99.843	6.408	0.000
Job type	−137.8	20.64	0.000		−11.43	2.149	0.000		−11.203	2.293	0.000
Age	−0.337	1.55	0.828		−0.159	0.161	0.324		−0.301	0.172	0.081
Pack-years	146.6	112.8	0.195		7.275	11.735	0.536		−1.904	12.52	0.879

Intercept	493.18	45.53	0.000		95.51	4.690	0.000		98.522	5.021	0.000
Job type	−137.8	20.58	0.000		−11.61	2.118	0.000		−11.35	2.272	0.000
Age	−1.930	1.259	0.127		−0.202	0.130	0.121		−0.250	0.139	0.073

Job type: 1=iron foundry; 0=bottling plant.