The selection of respondents in the first two subsamples was randomized.
Due to the lack of initial information on refugees who are privately accommodated and to the difficult access to Ukrainian refugees whose children are enrolled in Bulgarian educational institutions, these sub-samples were carried out by snowball recruitment and through allocating the interviewers in places where the subsample representatives are likely to be discovered. Due to the different ways of reaching the respondents - through their accommodation, through the Blue Dot centers, through the schools and among the Ukrainian refugee community, it is possible that there is an overlap between the respondents reached by the different approaches. In order to avoid overlap, the research team developed a procedure for pre-selection of respondents, by creating an additional question at the beginning of the questionnaire, which would indicate the cases in which the person had already been interviewed as part of one of the sub-samples. For the purposes of the analysis, groups were additionally constructed, depending on the type of accommodation that the refugees are residing in Bulgaria. There is an overlap between individuals in the subsamples (for example, individuals living in private accommodation could be recruited in the subsample of individuals using the services of Blue Dot centers or through Ukrainian refugees recruited in schools. In such cases, for analytical purposes, they fall into both subsamples, but were only surveyed once)
