Trends in Physical Fitness Among School-Aged Children and Adolescents: A Systematic Review.

Front Pediatr · 2020 · PMC7759499 · PMID 33363072

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a negative trendno p-value reported

Tests show a negative trend in the speed of boys and girls in the cohort of Flemish subjects in Belgium ( 27 ) and in girls in Poland ( 31 ).

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