Table 3.

Regression analysis of the simple mediation model.

Variable	Outcome: SC			Outcome: RA			Outcome: PD			Outcome: MPA
										Total			Mediator: SC			Mediator: RA			Mediator: PD
	B	SE	p	B	SE	p	B	SE	p	B	SE	p	B	SE	p	B	SE	p	B	SE	p
1 Gender	−0.13**	0.05	p < 0.001	0.01	0.05	0.8	−0.05	0.05	0.05	0.15***	0.05	p < 0.001	0.1***	0.04	p < 0.001	0.15***	0.05	p < 0.001	0.17***	0.045	p < 0.001
2 Major	0.02	0.02	0.38	−0.01	0.02	0.89	0.04	0.02	0.12	0.03	0.02	0.33	0.04	0.02	0.14	0.03	0.02	0.28	0.01	0.02	0.68
3 Grade	−0.07**	0.04	p < 0.01	0.04	0.04	0.12	0.03	0.04	0.25	0.07**	0.04	p < 0.01	0.042*	0.03	p < 0.05	0.06**	0.03	p < 0.01	0.06**	0.03	p < 0.01
4 PE	0.09***	0.03	p < 0.001	−0.07**	0.03	p < 0.01	−0.08**	0.03	p < 0.01	−0.11***	0.03	p < 0.001	−0.07**	0.02	p < 0.01	−0.08**	0.03	p < 0.01	−0.08**	0.03	p < 0.01
5 SC													−0.43***	0.02	p < 0.001	–	–	–	–	–	–
6 RA													–	–	–	0.35***	0.02	p < 0.001	–	–	–
7 PD													–	–	–	–	–	–	0.4***	0.02	p < 0.001
Results of bootstrapping mediation effect examination
Mediating effects					indirect		95%CI						Proportion			Degree of mediation
PE → SC → MPA (H1)					−0.04**		[−0.065, −0.017]						37.73%			Partial mediation
PE → RA → MPA (H2)					−0.025**		[−0.046, −0.006]						23.36%			Partial mediation
PE → PD → MPA (H3)					−0.031**		[−0.052, −0.011]						28.97%			Partial mediation

N = 1,843. M, meditation; PE, physical exercise; MPA, mobile phone addiction; SC, self-control; RA, Rumination; PD, psychological distress. Unstandardized regression coefficients are reported. Bootstrap sample size = 5,000.

^***p < 0.001;

^**p < 0.01;

^*p < 0.05.