Fig. 4From: Pre-natal exposures and breast tissue composition: findings from a British pre-birth cohort of young women and a systematic reviewSystematic review of studies investigating (a) birth size measurements and (b) maternal age and percent breast density. I. Birthweight and percent density, II. birth length and percent density, and III. head circumference and percent density data are shown. Studies classified as using a computer-assisted categorical breast density assessment method collected a quantitative measure of mammographic percent density but used a categorical measure in the analysisBack to article page