Table 6 Factors influencing access to premium education resources (logistic model) (N = 2872)

Male

.180

.317

Birth month

1.422**

.010

Birth month²

−.359**

.007

Family monthly income³ (yuan)

.003*

.038

Family monthly income⁴ (yuan)

.000

.109

Male × birth month × family monthly income³

−.008*

.035

Male × birth month² × family monthly income³

.003*

.038

Male × birth month × family monthly income⁴

.001*

.039

Male × birth month² × family monthly income⁴

.000*

.042

Only child

.015

.951

Cube of age

.000***

.000

Teacher-student relationship

−.520*

.025

Teacher-student relationship³

.071

.135

Only child × age³ × teacher-student relationship

.000***

.001

Only child × age³ × teacher-student relationship²

.000**

.003

Paternal occupation(government agencies or leadership position)

.327***

.001

Constant

−.685

.278

-2loglikelihood

R ²

N