Table 5.

Association of ethnicity, age, gender, and education with cataract-related severe visual impairment or blindness (< 20/200) by univariate analysis

Variables	Post-operative presumed severely visually impaired or blind		Unoperated cataract severely visually impaired or blind		Cataract social burdon		Surgical coverage
	Test statistics	P value	Test statistics	P value	Test statistics	P value	Test statistics	P value
Ethnicity	3.536	0.171	25.306	< 0.001	15.018	< 0.001	13.365	0.001
Age(years)	253,654	< 0.001	351.527	< 0.001	654.945	< 0.001	10.159	0.002
Gender	4.431	0.035	1.875	0.171	6.372	0.012	0.193	0.660
Education(years)	68.404	< 0.001	60.080	< 0.001	131.436	< 0.001	5.367	0.068