Table 3.

Mediation effect analysis based on a three-step regression.

	Step 1		Step 2				Step 3
	MH		Height		QD		MH
	β	t	β	t	β	t	β	t
(Constant)		5.63**		60.35**		10.00**		0.063
Sex	−0.00	−0.07	−0.62	−23.77**	0.04	0.95	0.14	3.08**
FR	0.19	5.12**	0.12	4.69**	−0.12	−3.10**	0.12	3.55**
Age	0.00	0.02	−0.00	−0.17	−0.04	−0.95	−0.01	−0.33
Major	0.06	1.62	0.13	4.91**	−0.04	−1.12	0.02	0.51
AP	−0.12	−3.35**	−0.07	−2.68**	0.10	2.61**	−0.07	−2.18*
FES	0.05	1.32	0.02	0.86	−0.09	−2.43*	0.01	0.34
EDQ	0.31	8.57**	0.21	8.01**	−0.26	−6.88**	0.18	5.01**
Height							0.21	4.13**
QD							−0.35	−9.93**
F	23.29		126.06		15.12		36.93
Adj.R2	0.19		0.57		0.13		0.33

Statistically significant difference: ^*p < 0.05, ^**p < 0.01. FR, Family Residence; EDQ, Early Diet Quality; MH, Mental Health; QD, Qi-deficiency; AP, Academic pressure; FES, Family Economic Status. Coding: male = 1, female = 2; rural area = 1, urban area = 2; science = 1, art = 2.