|Risk factor||Relative risk of breast cancer (95% CI)†|
|*Abbreviations defined in glossary.|
|†Relative risk of breast cancer associated with ⩾1 pregnancy ending as an abortion compared with never having had such a pregnancy. Relative risk <1 indicates a reduced risk of breast cancer. Analyses stratified by parity and age at first birth.|
|Spontaneous abortion||0.98 (0.92 to 1.04)|
|Induced abortion||0.93 (0.89 to 0.96)|
Review: spontaneous or induced abortion is not associated with development of breast cancer
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