Associations between smoking amount and breast cancer incidence by ethnic group.

*<p>adjusted for age, menopause status, age at menarche, BMI, exercise, HRT, OC, maternal breast cancer, parity, alcohol, and SEP.</p

Volumetric mammographic density measures by ethnicity and age.

<p>Volumetric mammographic density measures by ethnicity and age.</p

The effect of adjusting associations between smoking and breast cancer for potential confounders individually.

*<p>ever smoked status, adjusted for age, menopause status, age at menarche, SEP.</p

Associations between smoking status and duration, and breast cancer incidence by ethnic group.

*<p>adjusted for age, menopause status, age at menarche, BMI, exercise, HRT, OC, maternal breast cancer, parity, alcohol, and SEP.</p

Unadjusted and adjusted ratio of geometric means for volumetric percent mammographic density by ethnicity and age.

<p>Unadjusted and adjusted ratio of geometric means for volumetric percent mammographic density by ethnicity and age.</p

Characteristics of population controls according to never/ever smoking status.

<p>Characteristics of population controls according to never/ever smoking status.</p

Unadjusted and adjusted ratio of geometric means for volumetric absolute mammographic density by ethnicity and age.

<p>Unadjusted and adjusted ratio of geometric means for volumetric absolute mammographic density by ethnicity and age.</p

Distribution of smoking behaviours by ethnic group.

<p>Status includes all study subjects while other subsections include only current and/or ex-smokers.</p

Number (and %) of women in each category of absolute volumetric mammographic density by ethnicity and age.

<p>Number (and %) of women in each category of absolute volumetric mammographic density by ethnicity and age.</p

OR (95% CI) of breast cancer in pre-menopausal women according to the use of hormonal contraceptive treatment.

<p>(*) Adjusted for: age, socioeconomically status (high/medium/low), BMI (kg/m2), familial history of breast cancer in first degree relatives (yes/no), diabetes(yes/no), number of full term pregnancy, age at first full term pregnancy (years), total duration of breast feeding (months) and age at menarche (years).</p><p>(**) additional adjusted for European ancestry.</p><p>(***) We defined the recent use as the reported use of contraceptive treatment during the year prior to the date of interview.</p