In his book "El mito del fraude electoral en México" ("The myth of the electoral fraud in Mexico") Fernando Pliego Carrasco considered the timing of the results and related them to the "marginalization degree" of the electoral districts, as determined by the Consejo Nacional de Población's 2005 census. The marginalization degree of a district is a measure of the affluence of the district, its infrastructure, population centers size, and educational level. "Very low" marginalization represents an affluent district with good infrastructure and large, educated population. "Very high" marginalization represents a poor district with little or very poor infrastructure, and small, largely uneducated population.