HIGHLIGHTS
- who: Leila Oja and Jaanika Piksu00f6u00f6t from the The research was conducted among , students aged, (mean age , u00b1, ., years) in the, school year. The sixth-grade schoolchildren from four of Estonia`s largest counties-in the northern, southern, eastern, and western parts of the country-took part. As a result, (of , selected schools) schools agreed to participate in the study. During the data collection phase, the non-response was monitored by the lack of balance index. This index helps to balance the set of respondents with the set of auxiliary variables that were specified by strata definition . . .
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