Table 3.

Multivariable relative risk (RR) and 95% confidence interval (CI) 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 Groups	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)
Long-term Physical Activity
Combineda
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 trendb	0.003	0.63	0.03
Recent Physical Activity
Combineda
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 trendb	0.69	0.007	0.06

^aLong-term strenuous and moderate activity summary variable classifies women with no activity >0.5 hr/wk/yr activity into the low group, those with at least one of moderate or strenuous activity >3 hr/wk/yr into the high group, and all others, that is those with some activity that is >0.5 hr/wk/yr and ≤ 3 hr/wk/yr but not activity greater than 3 hr/wk/yr into the intermediate group.

^bP trend is the log-relative risk across categories (1, 2 and 3) of the strenuous-moderate summary variable. All models are stratified by age in years and adjusted for race, body mass index, total caloric intake, number of comorbid conditions and estrogen receptor status.