Adesione allo screening mammografico e livello di istruzione. Analisi del biennio 2004-2005 nel comune di Perugia per sezione censuaria di residenza - In this paper, in order to evaluate the access equity to mammographic screening program in the Local Health Unit of Perugia, during 2004-2005 years, we analyzed the participation rate by education level. As a proxy of individual educational level we used the percentage of low education (less than 5 school years) in any single census area where women lived. A slight but significant disadvantage has been measured among women living in areas with higher average educational levels. Methodological issues and particular socioeconomic feature in Perugia have been discussed. Key words: equity, screening, education, census area, epidemiology, perugina. Parole chiave: equità, screening, istruzione, sezione censimentaria, epidemiologia, Perugia.