. 2023 Jul 13;14:1226007. doi: 10.3389/fpsyg.2023.1226007

Table 6.

KHB mediated effect test of exercise duration on academic achievement: robustness test.

Independent variable	Total effect	Direct effect	Intermediate variables	Indirect effects	Indirect effects as a percentage
1 h	3.040***	1.524***	Physical Health	0.133*	4.37%
1 h	3.040***	1.524***	Cognitive ability	1.384***	45.51%
2 h	3.275***	1.691**	Physical Health	0.137*	4.19%
2 h	3.275***	1.691**	Cognitive ability	1.447***	44.19%
3 h	−1.821**	−1.813**	Physical Health	0.169**	−9.27%
3 h	−1.821**	−1.813**	Cognitive ability	−0.178	9.75%

t statistics in parentheses *p < 0.05, **p < 0.01, ***p < 0.001.