Table 5. Effect of physical exercise and positive attitude.

Instrumental variables	Independent variables	Direct effect	Mediation effect	Total effect	Percentage of the mediation effect (%)
Physical exercise	Structural social capital index	0.080	0.005	0.085	5.88
	Cognitive social capital index	0.147	0.003	0.150	2
Positive attitude	Structural social capital index	0.072	0.013	0.085	15.29
	Cognitive social capital index	0.099	0.051	0.150	34