Patienterne blev inddelt efter seks niveauer på basis af det øje, der var værst ramt: • Niveau 0 – ingen retinopati • Niveau 1 – minimal non- proliferativ retinopati • Niveau 2 – moderat non- proliferativ retinopati • Niveau 3 – svær non- proliferativ retinopati • Niveau 4 – fotokoagulerende retinopati • Niveau 5 – proliferativ retinopati
Patients were assigned to 1 of 6 retinopathy levels by the worst affected eye: • level 0 - no retinopathy • level 1 - minimal non-proliferative retinopathy • level 2 - moderate non-proliferative retinopathy • level 3 - severe non-proliferative retinopathy • level 4 - photocoagulated retinopathy • level 5 - proliferative retinopathy