. Author manuscript; available in PMC: 2017 Oct 1.

Published in final edited form as: Cancer Causes Control. 2016 Aug 22;27(10):1229–1237. doi: 10.1007/s10552-016-0801-y

Table 3.

The association between endometriosis and average percent mammographic density among pre-menopausal women at time of mammogram in the Nurses’ Health Study II stratified by covariates of interest

	N (%)	Model 1	Model 2	Model 3	P-value, test for effect modification
	N (%)	Difference (95% CI)			P-value, test for effect modification
BMI 18 < 20.6^a	614	4.44 (0.12, 8.76)	3.68 (−0.35, 7.71)	3.74 (−0.29, 7.78)	0.03
BMI 18 ≥ 20.6	616	−0.87 (−5.50, 3.77)	−0.07 (−4.85,4.71)	−0.21 (−5.09, 4.67)
BMI < 25	670	2.04 (−1.82, 5.91)	1.69 (−2.07, 5.46)	1.79 (−1.98, 5.57)	0.31
BMI ≥ 25	523	2.89 (−2.66, 8.44)	3.46 (−1.86, 8.77)	2.59 (−3.05, 8.23)

Model 1 Adjusted for age and BMI at mammogram

Model 2 Additionally adjusted for alcohol consumption, family history of breast cancer, smoking history, history of benign breast disease, bmi at age 18, parity, age at menarche, oral contraceptive use history, breast feeding history,

Model 3 Additionally adjusted for hysterectomy, hormone therapy

Median value