Table 1 Mean ± SE for continuous baseline covariates, and number (%) for categorical baseline covariates for breast cancer cases and controls occurring during the intervention phases of the Women’s Health Initiative CEE + MPA and CEE trials
CEE + MPA trial | CEE trial | |||||
|---|---|---|---|---|---|---|
Cases | Controls | P-value* | Cases | Controls | P-value* | |
N | 348 | 348 | 235 | 235 | ||
Age† | 64.32 ± 6.85 | 64.33 ± 6.82 | 0.98 | 64.5 ± 7.11 | 64.49 ± 7.06 | 0.97 |
BMI | 29.33 ± 5.56 | 28.46 ± 5.69 | 0.04 | 31.46 ± 5.98 | 29.32 ± 5.70 | <0.01 |
Gail model five-year risk score (%) | 1.85 ± 0.89 | 1.72 ± 0.84 | 0.05 | 1.84 ± 1.65 | 1.36 ± 0.90 | 0.08 |
Race (%)† | 0.99 | 0.98 | ||||
White | 305 (87.6) | 305 (87.6) | 184 (78.3) | 184 (78.3) | ||
Black | 21 (6.0) | 21 (6.0) | 36 (15.3) | 35 (14.9) | ||
Other | 22 (6.3) | 22 (6.3) | 15 (6.4) | 16 (6.8) | ||
Smoking (%) | 0.11 | 0.72 | ||||
Never | 158 (46.1) | 186 (54.1) | 129 (55.1) | 126 (53.6) | ||
Past | 155 (45.2) | 131 (38.1) | 87 (37.2) | 86 (36.6) | ||
Current | 30 (8.7) | 27 (7.8) | 18 (7.7) | 23 (9.8) | ||
Family history of breast cancer (%) | 0.006 | 0.23 | ||||
Yes | 79 (24.0) | 50 (15.2) | 52 (23.5) | 42 (18.5) | ||
No | 250 (76.0) | 280 (84.8) | 169 (76.5) | 185 (81.5) | ||