| Popis: |
The analysis to be presented in the sections below covers two levels: country and region. The regional analysis relies on the combined data of test results from all five countries. Where aggregation of data is required in the examination and comparison of results from different countries, we take into account the comparability of the data. Furthermore, because the samples used for the tests were not collected randomly, and came from the border provinces of these countries, which were areas kn... |
