Isotemporal Substitution Effects of Daily Time Use on Cardiorespiratory Fitness of Children in the OptiChild Study: A Mediation Analysis with Diet Quality.

At baseline, MVPA exhibited a positive correlation with CRF (β = 0.40, 95% CI: 0.23~0.58, p < 0.001) and FGDS (β = 0.15, 95% CI: 0.06~0.25, p = 0.002), and a marginally significant association with GDR score (β = 0.11, 95% CI: −0.01~0.23, p = 0.080) in the unadjusted model (Model 1).

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These results are consistent with sensitivity analysis, except when analyzing the mediation of diet quality in the association between screen time and CRF, where only a significant trend was observed ( Figures S1 and S2 ). 4.

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