1:1 double-blinded randomized controlled trial of patients to receive the intervention or standard information (control) at the study start in an information package. The intervention includes a decision aid (previously developed by Hersch et al. 2015, with minor modifications to reflect the Canadian context), a YouTube video link and an invitation to attend a group information session. The intervention or standard information, depending on participants assigned study group, will be mailed or emailed to participants. The information packages will also include questionnaires to collect data on outcome measures. There will be two study waves to account for women's eligibility at different time points (i.e. when approaching a mammogram due date). The first wave of participants will receive their information package at the study start and the second wave of participants will be sent their information packages 6 months after the study start. Each wave of participants will be followed for one year. Data collection will include quantitative measures of factors relevant to the decision-making process. Screening participant rates will be measured for each wave of participants, 6 months and 12 months after their respective enrollment date. Qualitative methods will be used to obtain an understanding of clinician's perception of decision aids in a primary care setting. Outcome measures and analyses will be blinded.
