Table 1.

General characteristics of breast cancer cases and controls in the BWHS

CharacteristicCases (n = 906)Controls (n = 1,111)
Mean age at baseline 1995 (SD)48 (10)48 (10)
Region of residence (%)
    Northeast26.725.6
    South31.030.8
    Midwest24.625.6
    West17.617.9
U.S. born (%)93.294.1
First-degree family history of breast cancer (%)14.18.5
Mean European ancestry, % (SD)19.2 (10.7)19.3 (10.3)

NOTE: Total number of subjects includes individuals genotyped for the TOX3 gene and individuals genotyped for the LOC643714 gene.