Table 2.

The estimated coefficients of socio-economic factors in SLM

Socio-economic variables	Coefficient	Std. Error	z-value	P-value
Ratio of urban to rural population	0.16	0.05	3.51	0.00**
Proportion of the tertiary industry	0.02	0.01	2.24	0.03*
Per capita GDP	1.10	0.33	3.30	0.00**
Proportion of the second industry	0.02	0.01	1.73	0.08
High school penetration rate	0.002	0.01	0.28	0.78
Per capita income of farmers	−4.73	5.35	−0.88	0.38
Population density of children under five	−0.05	0.03	−1.63	0.10

^**statistical significance level: 0.01

^*statistical significance level: 0.05