Table 1.

Characteristics of the Carolina Breast Cancer Study cases

	N = 2039
Age, years
Mean (SD)	51.9 (11.7)
Range	23 – 74
Ethnicity, n (%)
African American	766 (38)
European American	1,273 (62)
Menopausal status, n (%)
Premenopausal	912 (45)
Postmenopausal	1,127 (55)
Stage at diagnosis, n (%)‡
In situ	451 (23)
Invasive:
I	635 (33)
II	663 (34)
III	153 (8)
IV	44 (2)
Estrogen receptor status, n (%)
Positive	1,045 (59)
Negative	719 (41)
Follow up period, years
Median	9.0
Range	0.4–13.7

SD = standard deviation;

^‡American Joint Committee on Cancer criteria.