Table 4.

Association of adult abuse with breast cancer incidence, restricted to 2005–2009 incident period

	Cases	Person-years	Multivariable IRR (95% CI)a
No abuse across the life spanb	105	33,895	1.00 (referent)
Any abuse in adulthood	140	43,435	1.29 (1.02–1.64)
Adulthood
Type of abuse
Physical abuse only	68	21,322	1.30 (0.97–1.74)
Sexual abuse only	32	10,214	1.19 (0.81–1.74)
Both physical and sexual abuse	40	11,899	1.40 (0.97–2.01)
Physical abuse frequency c
Low	60	19,003	1.24 (0.90–1.72)
Intermediate	21	5,804	1.49 (0.91–0.243)
High	27	8,414	1.39 (0.86–2.24)
Sexual abuse frequency d
1–3 incidents	61	19,372	1.18 (0.81–1.74)
≥4 incidents	11	2,741	1.57 (0.76–3.26)

^aAdjusted for age, education, age at menarche, BMI at age 18, parity, age at first birth, OC use, menopausal status, age at menopause, FH use, vigorous activity, smoking status, alcohol intake, and family history of breast cancer. Adjusted for type and stage of abuse, when applicable

^bReference group for all analyses

^cExcludes women who reported sexual abuse only

^dExcludes women who reported physical abuse only