. 2016 May 5;2016:5928572. doi: 10.1155/2016/5928572

Table 4.

The effect of workplace and smoking and interaction between these factors in their effect on spirometric parameters in copper miners after 10, 20, and 25 years of work.

Effect	After 10 years		After 20 years		After 25 years
Effect	F	p	F	p	F	p
	% FVC		FVC		FVC
Workplace	0,72	0,4859	5,85	0,0075	8,32	0,0003
Smoking	1,77	0,1840	2,04	0,1633	0,04	0,8376
Workplace ∗ smoking	0,30	0,7391	4,22	0,0248	1,90	0,0089

	% FEV₁		FEV₁		% FEV₁
Workplace	0,91	0,4017	8,02	0,0017	0,83	0,4331
Smoking	0,15	0,6957	5,03	0,0328	1,97	0,1611
Workplace ∗ smoking	0,10	0,9088	5,02	0,0136	0,52	0,5934

	FEV₁/FVC		FEV₁/FVC		FEV₁/FVC
Workplace	0,39	0,6753	0,17	0,8385	2,36	0,0964
Smoking	0,79	0,3730	1,40	0,2463	4,32	0,0387
Workplace ∗ smoking	1,10	0,3339	0,29	0,7499	1,24	0,2901

	% PEF		% PEF		% PEF
Workplace	1,62	0,1972	1,11	0,3431	1,94	0,1457
Smoking	0,02	0,8768	0,26	0,6100	6,67	0,0102
Workplace ∗ smoking	0,50	0,6033	3,70	0,0373	1,76	0,1736

	% FEF₂₅		% FEF₂₅		% FEF₂₅
Workplace	0,65	0,5220	1,41	0,2593	0,36	0,6958
Smoking	1,72	0,1900	4,09	0,0525	3,33	0,0691
Workplace ∗ smoking	0,28	0,7534	3,44	0,0460	0,75	0,4725

	% FEF₅₀		FEF₅₀		% FEF₅₀
Workplace	0,44	0,6382	3,38	0,0481	0,33	0,7188
Smoking	0,13	0,7133	2,73	0,1096	2,81	0,0944
Workplace ∗ smoking	0,76	0,4638	3,84	0,0334	0,64	0,5275

	% FEF₇₅		% FEF₇₅		% FEF₇₅
Workplace	0,62	0,5362	0,39	0,6775	0,95	0,3878
Smoking	0,29	0,5899	1,67	0,2067	4,48	0,0350
Workplace ∗ smoking	1,74	0,1750	3,35	0,0494	0,54	0,5819

Spreadsheet of two-way analysis of variance; one-dimensional tests of significance. F: F-test value for the respective effects; p: the probability level of p; values indicated in bold are statistically significant.