Prevalence of diabetic retinopathy in the region of Girona. Study of related factors

To determine of the prevalence of diabetic retinopathy in the general diabetic population in the Girona region and epidemiologic study of the related factors. A population-based cross-sectional study of a randomised sample taken of 401 diabetics in the Girona region. Descriptive statistical analysis of the ocular lesions in relation to diabetic retinopathy and analysis of logistic regression in order to determine the related factors. 30.6% (IC 95%: 26.5-35.5) of the sample presented some degree of diabetic retinopathy, 19.4% (IC 95%: 15.4-24.0) at the initial stage, 8.4% (IC 95%: 5.8-1.9) pre-proliferative and 2.6% (IC 95%: 1.3-5.1) at a proliferative stage. Regarding the type of diabetes, 53% of the patients with type 1 diabetes and 34.2% of those with type 2 diabetes had retinopathy. Retinopathy was observed in 15.7% of diabetics with less than 10 years of diabetes evolution, 51.3% in those between 10 and 20 years and 62.8% in those with more than 20 years. The concentration of HbA1C was significantly associated with the degree of retinopathy. Of those patients with retinopathy, 60.3% were insulin-treated, 30.6% with oral hypoglucemiants and 10.3% on diet only. Patients with family antecedents of retinopathy presented a prevalence three times greater than those without. Approximately one in three diabetic patients exhibited some degree of retinopathy in this study dealing with a population-based cohort of diabetic patients in Spain. The prevalence was greater among type I diabetic patients. As expected, years of evolution of the disease, type of treatment and diabetic metabolic control were the most significant factors influencing the presence of retinopathy.