The scatterplot between the fibroglandular tissue percentage (%) and age of all 321 patients, including 180 Caucasians, 71 Asians, and 70 Hispanics. There is a wide distribution within each race/ethnicity group. It is noted that in the upper part of the figure with the highest densities, the Asian women are the dominating group. Also noted is the clear trend of decreasing density over the age of 55.
Distribution of the (a) mean fibroglandular tissue volume and (b) the mean percent density in the three age groups (, 45–55, and old) within the Caucasian (non-Hispanic White), Asian, and Hispanic race/ethnicity groups. The original, untransformed data are plotted. Due to lack of normality of the parameters, the statistical analysis was performed based on an ANOVA of the transformed data. The fibroglandular tissue volume and the percent density in Caucasian, Asian, and Hispanic women all decrease across the three age groups .
Number of patients in each age and race/ethnicity category .
Mean and standard deviation of untransformed breast volume, fibroglandular tissue volume, and percent density for the study population in different age and race groups. (C: Caucasian, A: Asian, and H: Hispanic.)
Comparison of fibroglandular tissue volume in three race/ethnicity groups. (CI: confidence interval.)
Comparison of the percent fibroglandular density in three race/ethnicity groups.
Article metrics loading...
Full text loading...