Table 3 Regression model of mediating effects of self-esteem and psychological capital.

Regression equation		Overall fit index				Significance of coefficients
outcome variable	predictor variable	R	R²	ΔR²	F	β	t
Sense of security	Physical activity	0.316	0.100	0.009	13.060	0.271	6.781^***
	Gender					0.160	2.134
	Year					− 0.073	− 1.693
	Professional category					0.025	0.619
	Whether the only child					0.025	0.417
Self-esteem	Physical activity	0.236	0.056	0.014	6.961	0.114	4.347^***
	Gender					0.104	2.121
	Year					− 0.036	− 1.259
	Professional category					− 0.027	− 1.020
	Whether the only child					0.053	1.360
Psychological capital	Physical activity	0.413	0.170	0.114	20.107	0.251	5.988^***
	Self-esteem					0.483	7.441^***
	Gender					0.082	1.060
	Year					− 0.109	− 2.420
	Professional category					− 0.008	− 0.192
	Whether the only child					− 0.094	− 1.522
Sense of security	Physical activity	0.607	0.369	0.199	48.965	0.117	3.346^***
	Self-esteem					0.543	9.843^***
	Psychological capital					0.299	8.930^***
	Gender					0.064	1.006
	Year					− 0.016	− 0.445
	Professional category					0.046	1.357
	Whether the only child					0.016	0.326

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