[Differences in the factors related to the use of mammograms among Spanish women in 1994 and 2000].

Background: The screening mammography is the most highly effective procedure for early breast cancer detection. This study is aimed at ascertaining the differences in the factors related to Spanish women 40-70 years of age having had mammograms in 1994 and 2000 and among those having had at least one mammogram within the two years prior.

Method: Comparison of the results of two surveys conducted in 1994 and 2000, each on samples of women representative of Spanish women 40-70 years of age (3,218 in 1994 and 2,409 in 2000).