Table 5. Hazard ratios (HR) and 95% confidence intervals (CI) for breast cancer by estrogen receptor status.
| Occupational Physical Activity | ER+ | ER- | ||
|---|---|---|---|---|
| Cases N=1,300 No. (%) |
HRa | Cases N=271 No. (%) |
HRa | |
| Activebjob | ||||
| Ever | 288 (22) | 0.90 (0.77, 1.04) | 65 (24) | 1.00 (0.73, 1.38) |
| Never | 1,012 (78) | 1.00 | 206 (76) | 1.00 |
| Total work years in active jobs | ||||
| 10+ years | 115 (9) | 0.81 (0.65, 1.01) | 32 (12) | 1.20 (0.79, 1.84) |
| 5-<10 years | 79 (6) | 1.05 (0.82, 1.34) | 14 (5) | 0.93 (0.52, 1.65) |
| <5 years | 94 (7) | 0.88 (0.70, 1.11) | 19 (7) | 0.83 (0.50, 1.41) |
| Never | 1,012 (78) | 1.00 | 206 (76) | 1.00 |
| Ptrendc | 0.48 | 0.17 | ||
| Proportion of work years in active jobs | ||||
| 0.75 - 1.00 | 37 (3) | 0.71 (0.49, 1.03) | 12 (4) | 1.10 (0.56, 2.18) |
| 0.50 - <0.75 | 52 (4) | 0.91 (0.66, 1.25) | 14 (5) | 1.54 (0.88, 2.71) |
| 0.25 - < 0.50 | 70 (5) | 0.88 (0.68, 1.14) | 11 (5) | 0.72 (0.37, 1.37) |
| 0 - <0.25 | 121 (9) | 0.97 (0.79, 1.18) | 25 (4) | 0.94 (0.59, 1.49) |
| Never | 1,012 (78) | 1.00 | 206 (76) | 1.00 |
| Ptrendc | 0.34 | 0.32 | ||
a
Hazard ratios are adjusted for race/ethnicity, education, income, parity, menopausal status, age at menopause, BMI, recreational physical activity and work at night.
b
Active defined as continuous walking or heavy manual labor.
c
Tests for trend among ever active only.
Note: Differences in the total numbers of cases are due to missing values.