The SERVIDIAH study (Evaluation of Health Services for Diabetic and Hypertensive Subjects) was conducted in 2010 in the State of Pernambuco, Brazil. A multi-stage random sample of 785 hypertensive and 823 diabetic patients was drawn from 208 Family Health Strategy (FHS) units selected throughout 35 municipalities. Patients underwent a structured interview and weight, height, blood pressure and HbA1c levels (for...