Table 4.

Mean difference in quality of life

Category	Visual impairment	Mean difference	P	95% CI
				Lower	Upper
Mild	Blindness	22.81	<0.0001	12.57	33.03
	Moderate	9.76	0.02	1.24	18.28
	Severe	10.17	0.03	0.67	19.68
Blindness	Mild	−22.81	<0.0001	−33.03	−12.57
	Moderate	−13.04	0.01	−23.57	−2.50
	Severe	−12.62	0.02	−23.97	−1.28
Moderate	Mild	−9.76	0.02	−18.28	−1.24
	Blindness	13.04	0.01	2.50	23.57
	Severe	0.41	0.97*	−9.42	10.25

*Not significant. CI: Confidence interval