Table 5. Association between duration of diabetes and retinopathy.

Duration of diabetes	Types of diabetic retinopathy
	Absent	Non-proliferative retinopathy	Proliferative retinopathy
<5 years	60(61.9%)	13(37.1%)	0(0% )
6-10 years	18(18.6%)	4(11.4% )	1(20.0%)
11-20 years	15(15.5%)	11(31.4% )	2(40.0%)
>20 years	4(4.0%)	a7(20.0%)	a2(40.0%)

^aP<0.005