Baseline characteristics of breast cancer cases and normal controls.

Abbreviations: n = number; SD = standard deviation, sq. = square.1Significance of difference between cases and controls.2Significance of difference between BLV+ and BLV-.3Race/ancestry—patient’s self-classification in medical records. ‘Other’ includes 56 African Americans, 3 Asian Americans, 2 other race.4number of subjects (% of total in case and control categories).5Tissue age—the time between initial formalin fixation and the performance of the in situ PCR assay.6Area of epithelium–total area of mammary epithelium present in the breast tissue specimen.Baseline characteristics of breast cancer cases and normal controls.