Table 2. Diabetic retinopathy (DR) status based on the duration of diabetes mellitus and age > 40 years.

DR status	Patients		Total	p-value
Age group, years	≤ 40	> 40		0.010
Normal, n	114	377	491
Retinopathy, n	30	87	117
Total	144	464	608
Duration, years	< 10	≥ 10		0.620*
Normal
n	274	219	493
% of DR	55.6%	44.4%
Retinopathy
n	50	68	118
% of DR	42.4%	57.6%
Total	324	287	611