Then, they examined the baseline characteristics of the women by using descriptive statistics and calculated cumulative incidence. Also, they calculated standardized mortality ratio to compare the risk of death from breast cancers among the women diagnosed with DCIS with the US population. In addition, the researchers performed a Cox proportional hazards regression analysis to examine influences of year of diagnosis, age at diagnosis, ethnicity, and grade on the hazard ratio (HR) of death among the women, and treatment on the HR for death in the
Then, they examined the baseline characteristics of the women by using descriptive statistics and calculated cumulative incidence. Also, they calculated standardized mortality ratio to compare the risk of death from breast cancers among the women diagnosed with DCIS with the US population. In addition, the researchers performed a Cox proportional hazards regression analysis to examine influences of year of diagnosis, age at diagnosis, ethnicity, and grade on the hazard ratio (HR) of death among the women, and treatment on the HR for death in the