Table 6: ROC area for VEGF-A and sorbitol when used as tests to diagnose any type of DR.

Study Groups and Variables	ROC Area	P
DNR X DR
VEGF	0.806	< 0.001
Sorbitol	0.849	< 0.001
DNR X NPDR
VEGF	0.768	< 0.001
Sorbitol	0.824	< 0.001
NPDR X PDR
VEGF	0.656	0.003
Sorbitol	0.73	< 0.001