Figure 1.

Flowchart of study population. In the primary analysis, end of follow-up occurred at the earliest of breast cancer diagnosis (first diagnosis of invasive BC or DCIS), non–breast cancer-related death, last date of complete capture of cancer or vital status data, or 10 years after the screening mammogram. In the secondary analysis, end of follow-up occurred at the earliest of breast cancer death, non–breast cancer-related death, last date of complete capture of cancer or vital status data, or 10 years after the screening mammogram. BC = breast cancer; DCIS = ductal carcinoma in situ.