Does the English Breast Screening Programme's information leaflet improve women's knowledge about mammography screening? A before and after questionnaire survey.

Objectives: To explore whether the English Breast Screening Programme's leaflet improved women's knowledge of breast cancer screening. Design Before and after postal questionnaire survey. Participants A random sample of 100 women aged between 49 and 64 years registered with GPs in Oxfordshire on whom data from a prospective, questionnaire survey was available on knowledge and perception of breast cancer screening.

Results: Women's knowledge of lifetime risk had improved significantly (p < 0.0001) after the leaflet; however, the 'qualitative' interpretation of this numeric risk varied. The proportion of women who said the purpose of screening was to enable simpler treatments had increased from 34 to 45% (p = 0.05). Thirty-two per cent who had previously responded that screening prevented breast cancer now responded correctly; 20% who responded correctly before the leaflet now responded incorrectly. None of the women thought that all screen-detected cancers could be cured; 95% of the women said they were very likely to attend breast screening if invited, and the rest said they were 'fairly likely' to attend. Additional information women wanted included: what causes breast cancer; percentage rates for survival with and without mammograms; and lifestyle advice on how to avoid breast cancer.

Conclusions: Although the leaflet had improved women's knowledge of the purpose of screening in some areas, some simple messages in the leaflet had not been understood by all women.