Table 4. Hazard ratios (HR) and 95% confidence intervals (CI) for breast cancer by menopausal status.
| Occupational Physical Activity | Premenopausal | Postmenopausal | ||
|---|---|---|---|---|
| Cases N=422 No. (%) |
HRa | Cases N=1363 No. (%) |
HRb | |
| Activecjob | ||||
| Ever | 125 (30) | 1.06 (0.84, 1.33) | 279 (20) | 0.86 (0.74, 1.00) |
| Never | 297 (70) | 1.00 | 1,084 (80) | 1.00 |
| Total work years in active jobs | ||||
| 10+ years | 42 (10) | 1.01 (0.71, 1.44) | 125 (9) | 0.85 (0.68, 1.05) |
| 5-<10 years | 38 (9) | 1.25 (0.89, 1.77) | 65 (5) | 0.89 (0.68, 1.17) |
| <5 years | 45 (11) | 1.00 (0.69, 1.35) | 89 (7) | 0.85 (0.67, 1.08) |
| Never | 297 (70) | 1.00 | 1,084 (80) | 1.00 |
| Ptrendd | 0.12 | 0.34 | ||
| Proportion of work years in active jobs | ||||
| 0.75 - 1.00 | 16 (4) | 0.84 (0.48, 1.47) | 37 (3) | 0.67 (0.45, 0.98) |
| 0.50 - <0.75 | 22 (5) | 1.14 (0.73, 1.79) | 59 (4) | 1.09 (0.81, 1.47) |
| 0.25 - < 0.50 | 33 (8) | 1.10 (0.76, 1.60) | 59 (4) | 0.73 (0.55, 1.00) |
| 0 - <0.25 | 48 (11) | 1.01 (0.74, 1.41) | 117 (9) | 0.93 (0.75, 1.14) |
| Never | 297 (70) | 1.00 | 1,084 (80) | 1.00 |
| Ptrendd | 0.81 | 0.73 | ||
a
Hazard ratios are adjusted for race/ethnicity, education, income, parity, BMI, recreational physical activity and work at night.
b
Hazard ratios are adjusted for race/ethnicity, education, income, parity, age at menopause, BMI, recreational physical activity and work at night.
c
Active defined as continuous walking or heavy manual labor.
d
Tests for trend among ever active only.
Note: Differences in the total numbers of cases are due to missing values.