In the cancer incidence analysis, all reported cancers and their
incidence in respective groups were taken into account. The analysis
concluded with the investigation of the relationship between the
pollution level and the occurrence of changes in each sex. Upon
collection of the results for particular years, the relationships between
particular periods were analyzed. Thus, it was possible to state what
changes influenced the selection of particular periods: did the
pollution level change, to what extent and which factors changed
significantly?