Table 6. Hazard ratios (HR) and 95% confidence intervals (CI) for total breast cancer associated with intensity of occupational physical activity (current workers at baseline n = 31,289).
| Intensity | Cases N=1,125 No. (%) |
HRa |
|---|---|---|
| Longest held job | ||
| Active b | 103 (9) | 0.84 (0.66, 1.08) |
| Mostly standing | 201 (18) | 0.96 (0.80, 1.15) |
| Sitting and standing equally | 264 (23) | 1.05 (0.89, 1.23) |
| Mostly sitting | 557 (50) | 1.00 |
| Ptrend | 0.74 | |
| Current job | ||
| Active b | 81 (7) | 0.75 (0.58, 0.96) |
| Mostly standing | 185 (16) | 0.93 (0.78, 1.11) |
| Sitting and standing equally | 231 (20) | 0.87 (0.74, 1.02) |
| Mostly sitting | 633 (56) | 1.00 |
| Ptrend | 0.18 |
a
Hazard ratios are adjusted for race/ethnicity, education, income, parity, menopausal status, age at menopause, BMI, recreational physical activity, total number of work years, and work at night.
b
Active defined as continuous walking or heavy manual labor.
Note: Differences in the total numbers of cases are due to missing values.