Table 1.

Eligibility Criteria for Inclusion of Studies.

Characteristics	Criteria
Study year	Studies published to November 2014
Study design	1. Randomized controlled trials
	2. Case-control studies
	3. Nested case-control studies
	4. Cohort studies
	5. Cross-sectional studies
	6. Longitudinal studies
Population	Women of all ages
Intervention	1. Estrogen-receptor modulators
	2. Aromatase inhibitors
	3. Physical activity
	4. Diet
Comparator	Relationship between interventions and breast density
Outcomes	Mammographic breast density