Additionally, the subjective happiness level, initially at 3.13 during wave 1, displayed a decreasing trend as students progressed to 3.06 at the highest grade.
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The Longitudinal Mediating Effect of Smartphone Dependency on the Relationship between Exercise Time and Subjective Happiness in Adolescents.
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The sentences
Latent growth modeling results revealed a significant linear decrease in adolescents’ exercise time and subjective well-being each year, while smartphone dependency exhibited an increasing trend.