highly significantp<0.001
The research findings illustrated that the cumulative sum (three paths) of the indirect relationships between smartphone addiction and cognitive failures was highly significant in Egypt (β = 0.526***p<0.001, f 2 = 0.383) and KSA (β = 0.554***p<0.001, f 2 = 0.391), with a large effect size in both countries. 126 Besides, the Bootstrapped Confidence Interval does not straddle with the value of zero, confirming full mediation effects in Egypt (β = 0.290***p<0.001 f 2 = 0.211), and KSA (β = 0.318***p<0.001 f 2 = 0.224) and supporting H8.