From:  Assessment of cardiovascular disease-associated mortality risk among early-stage breast cancer patients

 Risk of CSM compared with the age-adjusted US female population.

Age at diagnosisObserved deathsExpected deathsPerson-years at riskSMR (95% CI)
Total6,2505,384.791,576,158.161.16* (1.13–1.19)
< 5014650.45338,596.832.894* (2.461–3.404)
50–59423371.78402,364.081.138* (1.034–1.252)
60–691,2801,059.32458,182.171.208* (1.144–1.276)
70–854,4013,903.24377,015.081.128* (1.095–1.161)

*: SMR with P < 0.05. CI: confidence intervals; CSM: cardiovascular-specific mortality; SMR: standardized mortality ratio; US: United States.