(Solved): Researchers examined the association between induced and spontaneous abortion and the incidence of b ...

Researchers examined the association between induced and spontaneous abortion and the incidence of breast cancer in a prospective cohort of young women, the Nurses' Health Study II (Michels et al., 2007). The study induced 105, 716 women 29 to 46 years old at the start of follow-up 1993. Information on induced or spontaneous abortions was collected in 1993 and updated biennially. a) Why do you think the study considered induced and spontaneous abortions as two separate outcomes? Excluding women who had been diagnosed as having cancer (

), who did not answer the question on abortion (

), or who did not respond in