Table 2.

Correlations between the socioeconomical Indicators and the visual impairment rate

	Visual impairment rate	Gini coefficient of property	Logarithms of the average property	Gini coefficient of education	Average educational duration	Educational return*
Visual impairment rate	1	0.326*	0.530***	−0.391**	0.544***	0.330*
Gini coefficient of property		1	0.126	0.090	0.077	0.014
Logarithms of the average property			1	−0.582***	0.861***	0.320*
Gini coefficient of education				1	−0.809***	−0.231
Average educational duration					1	0.425**
Educational return						1

*P<0.05; **p<0.01; ***p<0.001.

*Educational return was calculated through the Mincerian model.