Table 3.

HRs and 95% CIs for the associations between hours/week of physical activity and breast cancer risk by invasive ER status, The Sister Study

ERER+
N casesHRa (95% CI)N casesHRa (95% CI)
Total average hours/week
 Continuous3040.98 (0.94–1.02)1,7330.98 (0.97–1.00)
 0–<11051.005991.00
 1–<41341.06 (0.82–1.37)6960.87 (0.78–0.97)
 4–<7420.82 (0.57–1.18)2940.86 (0.75–1.00)
 ≥7230.85 (0.54–1.35)1440.78 (0.65–0.94)
Total average MET-hours/week
 Continuous (IQR increase)3040.97 (0.86–1.09)1,7330.94 (0.89–0.99)
 Quartile 1791.004551.00
 Quartile 2710.86 (0.62–1.18)4290.83 (0.73–0.95)
 Quartile 3911.20 (0.88–1.63)4290.85 (0.74–0.97)
 Quartile 4630.80 (0.57–1.12)4200.78 (0.68–0.90)
At least one activity in the past 12 months
 No451.003061.00
 Yes2591.18 (0.85–1.63)1,4270.84 (0.74–0.95)
  • Abbreviations: −, negative; +, positive.

  • aAdjusted for race, residence type, education, parity, alcohol use, and smoking status.