Multivariable relative risk and 95% confidence interval for the association between physical activity prior to diagnosis and death by cause among women diagnosed with invasive breast cancer from 1995-2004 in the California Teachers Study
| Physical activity group | Death due to breast cancer (n = 221) | Death due to any cause other than breast cancer (n = 239) | Death due to any cause (n = 460) |
|---|---|---|---|
| RR (95% CI) | RR (95% CI) | RR (95% CI) | |
| Long-term physical activity | |||
| Combined* | |||
| Low | 1.00 | 1.00 | 1.00 |
| Intermediate | 0.65 (0.45-0.93) | 0.98 (0.69-1.38) | 0.83 (0.65-1.07) |
| High | 0.53 (0.35-0.80) | 0.91 (0.62-1.34) | 0.73 (0.55-0.96) |
| P trend† | 0.003 | 0.63 | 0.03 |
| Recent physical activity | |||
| Combined* | |||
| Low | 1.00 | 1.00 | 1.00 |
| Intermediate | 1.17 (0.84-1.65) | 0.76 (0.56-1.03) | 0.89 (0.71-1.11) |
| High | 1.08 (0.73-1.58) | 0.61 (0.42-0.88) | 0.78 (0.60-1.02) |
| P trend† | 0.69 | 0.007 | 0.06 |
NOTE: All models are stratified by age in years and adjusted for race, BMI, total caloric intake, number of comorbid conditions, and estrogen receptor status.
↵*Long-term strenuous and moderate activity summary variable classifies women with no activity >0.5 h/wk/y activity into the low group, those with at least one of moderate or strenuous activity >3 h/wk/y into the high group, and all others, that is, those with some activity that is >0.5 h/wk/y and ≤3 h/wk/y but not >3 h/wk/y into the intermediate group.
↵†P trend is the log-relative risk across categories (1, 2, and 3) of the strenuous-moderate summary variable.