A study was carried out; its design was cross-sectional (measurement of all variables), bilective (gathering of data in files and interviews to diabetic persons), retrospective (the subjects assessed were asked to locate themselves temporarily in a unit of a month prior to evaluation);
homodemic (population beneficiary of the Mexican Institute of Social Security [IMSS]); multicentric (sample was obtained in two family practice clinical centers); and analytical (for its scope in the analysis and explanation of the relation between variables).