The observed relationship with ER-negative tumors for >7 hours per week of moderate-to-vigorous activity during the past 10 years was also inverse (RR: 0.87, 95%CI:0.58,1.29), but failed to reach statistical significance.
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Intensity and timing of physical activity in relation to postmenopausal breast cancer risk: the prospective NIH-AARP diet and health study.
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