Barely Significant

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Epidemiological data from the World Health Organization (WHO) and the Global Burden of Disease Study indicate an important trend: although age-standardized incidence and mortality rates of stroke have shown a moderate decline, the absolute number of stroke cases among older adults worldwide has increased markedly because of the rapid growth of the aging population ( Torres-Roman et al., 2025 ).
While the control group displayed relatively stable levels of wellbeing between the pretest and posttest measurements—with an effect size of d = 0.00 indicating a complete absence of change—participants in the intervention group experienced a meaningful increase in positive psychological functioning following regular participation in physical activity, with a within-group effect size of d = 0.93 indicating a large and practically significant improvement.