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Objective: To evaluate the prevalence of chronic vascular complications and associated factors in patients with type 1 diabetes mellitus (DM)., Methods: Cross sectional study with type 1 DM patients attending the Endocrine Division, Hospital de Clinicas de Porto Alegre. Patients were evaluated for presence of chronic vascular complications., Results: We evaluated 573 patients, mean age of 33 years. The presence of diabetic retinopathy (DR) was observed in 43.3%, diabetes duration [OR: 1.07, 95% CI: 1.03 to 1.11, P <0001], the presence of diabetic nephropathy (DN) [OR: 3.40; CI 95%: 1.89 to 6.13, P <0001] and hypertension (HPT) [OR: 2.12, 95% CI: 1.16 to 3.87, P = 0014] were associated with DR. The DN was present in 34.5% and was associated with HPT [OR: 1.93, 95% CI: 1.16 to 3.21, P = 0001] and total cholesterol [OR: 1.0, 95% CI: 1.0-1.01, P = 0.05]. Seven patients had macrovascular disease. Only 22% achieved an A1c of <7.0%. HPT was 33% and 48% had levels <130/80 mm Hg and 45% of patients had values for LDL> 100 mg/dl., Conclusion: We observed a high prevalence of microvascular complications and HPT. Duration of DM, HPT and presence of DN were associated with DR. HPT and dyslipidemia were associated with DN. Most patients did not meet the desired glycemic control, blood pressure and lipid targets. Greater efforts are needed to intensify the pressure and metabolic control of patients with type 1 DM.