Table 1 Characteristics of breast cancer cases (overall and by ER status) and controls
Controls ( N =84 778) | All cases ( N =84 778) | ER-positive casesa (N =56 296) | ER-negative casesa (N =9991) | |
|---|---|---|---|---|
% | ||||
Age in years (median) | (76.0) | (76.0) | (76.0) | (75.0) |
67–70 | 19.2 | 19.1 | 19.2 | 21.3 |
71–75 | 28.0 | 28.3 | 28.6 | 29.4 |
76–80 | 24.9 | 25.3 | 25.8 | 24.4 |
81–84 | 14.6 | 13.9 | 16.4 | 15.2 |
85+ | 13.3 | 13.3 | 10.1 | 9.7 |
Race | ||||
White | 83.7 | 88.5 | 89.8 | 84.7 |
Black | 7.7 | 6.4 | 5.2 | 9.4 |
Hispanic | 2.4 | 1.3 | 1.2 | 1.5 |
Others/unknown | 6.2 | 3.8 | 3.8 | 4.4 |
Region of residence b | ||||
Western | 51.2 | 51.3 | 52.8 | 47.9 |
Northeastern | 17.0 | 17.6 | 16.6 | 18.8 |
North-central | 20.1 | 20.1 | 20.0 | 21.1 |
Southern | 11.7 | 11.0 | 10.6 | 12.2 |
Income c | ||||
<$25 000 | 20.8 | 18.7 | 18.3 | 20.2 |
$25 000–$34 999 | 28.1 | 28.1 | 28.5 | 28.2 |
$35 000–$49 999 | 32.4 | 33.0 | 33.0 | 32.4 |
⩾$50 000 | 13.2 | 14.0 | 14.2 | 13.4 |
Unknown | 5.4 | 6.2 | 6.0 | 5.8 |
Selection year | ||||
1993–1995 | 22.5 | 22.5 | 21.1 | 23.3 |
1996–1999 | 31.5 | 31.5 | 31.9 | 32.5 |
2000–2002 | 46.0 | 46.0 | 47.0 | 44.2 |
Mammography d | ||||
Yes | 45.4 | 50.5 | 52.0 | 48.7 |
No | 54.6 | 49.5 | 48.0 | 51.3 |
Months of coverage e (median) | (102.0) | (101.0) | (102.0) | (98.0) |
12–23 | 3.2 | 3.2 | 3.3 | 3.1 |
24–59 | 19.2 | 19.2 | 19.3 | 21.1 |
60+ | 77.6 | 77.6 | 77.4 | 75.8 |
Number of physician visits f (median) | (11.0) | (12.0) | (12.0) | (12.0) |
0 | 16.0 | 15.3 | 15.2 | 15.2 |
1–11 | 36.7 | 35.2 | 35.3 | 36.8 |
12–23 | 23.2 | 24.4 | 24.7 | 23.4 |
24+ | 24.1 | 25.1 | 24.8 | 24.6 |
