Research Article
Association between the Type of Workplace and Lung Function in Copper Miners
Table 2
FEV1/FVC ratio in the studied groups of copper miners at the start of employment (the first spirometry) and 10, 20, and 25 years later.
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Paired -test for dependent samples. Statistically significant difference in comparison to the results of the first spirometry performed in the group of all miners (total); < 0,01; < 0,001. |