Structured Diabetes Self-Management Education in Primary Care and Metabolic Control

Design: This was a single-center, parallel-group, randomized study Setting: One Primary Care Unit named Santa Cecília/Hospital de Clínicas de Porto Alegre Basic Unit of health, in Porto Alegre, Brazil.

Patients: Adult subjects (more than 18 years-old) up to the age of 80 years, with Type 2 diabetes, and with A1c >7%, regularly attending the primary care unit in the previous 6 months before the trial.

Exclusion criteria were: history of active infection (eg. osteomyelitis, pulmonary tuberculosis, AIDS), chronic corticosteroids use, unstable angina or myocardial infarction in the last 3 months, advanced renal disease require dialysis, heart failure (New York Heart Association class III and IV), cirrhosis, alcohol or illicit drug use, dementia, actual pregnancy or lactation, current cancer or any disease that might affect survival in the next 5 years.

Intervention: The intervention group (I) attended a five-week education course and reinforcement meetings every 4 months, for one year. The control group (C) received usual medical care.

Measures: Clinical (age, gender, ethnicity, history of hypertension and BP levels, smoking and physical activity), anthropometrical (weight, height, and waist circumference) and laboratorial data (fasting glucose levels, A1c, and lipid profile) The Diabetes knowledge was estimated by a questionnaire composed by 22 questions addressing the information discussed in the meetings and will be referred as type 2 DM knowledge score. This measures were done at 0, 4, 8 and 12 months End-points: The primary endpoint was changes in HbA1c at 4, 8 and 12 months. Additional analyses were done to evaluate changes in type 2 DM literacy, blood pressure (BP), body mass index (BMI) and lipids.

Statistical Analysis: Student t and chi-square test were used to compare baseline continuous and categorical variables, respectively. Variables with non-normal distribution were log transformed. Global linear model (GLM) for repeated measurements, with Bonferroni post-hoc test, was used to analyze changes in the outcomes during the trial. HbA1c values after the interventions were adjusted to baseline A1c and dosage of insulin at 12 months by ANCOVA. All patients with at least one A1c measurement available after randomization were included in the analyses, regardless if they attended all meetings of the education course or not (intention to treat analysis). A P value <0.05 (two-tailed) was considered significant.