Figure 3.

Women recorded as irradiated with left‐sided breast cancer versus women recorded as irradiated with right‐sided breast cancer: Cardiac mortality rate ratios by patient, tumour and treatment characteristics and geographic region. Rate ratios estimated by Poisson regression with stratification by time since breast cancer diagnosis, age at breast cancer diagnosis, calendar year of breast cancer diagnosis and country. See Supporting Information Figure S2 for analyses of women irradiated <1990 and 1990+ combined.