Mental well-being in Swedish adolescents 2014-2023: A repeated population-based cross-sectional study focusing on temporal variations and differences between groups.

Although few studies have examined trends regarding mental well-being among adolescents, those that have done so, show a decreasing trend [ 32 , 33 ].

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In social science data, the recommended minimum level for effect size estimates to assess practically significant effect is 0.41 for Cohen’s d and 0.04 for Eta squared ( η 2 ) [ 44 ].

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