Table 3

Lifetimea physical activity and breast cancer risk, by type of activity and menopausal status

Premenopausal womenPostmenopausal women
Hours/weekCases n = 403Controls n = 483ORb (95% CI)ORc (95% CI)Hours/weekCases n = 847Controls n = 1065ORb (95% CI)ORd (95% CI)
Total activityeTotal activitye
 <9.11701611.0 1.0 <9.63353541.01.0
 9.1–20.71331600.79 0.58–1.090.88 0.63–1.22 9.6–21.62673550.800.64–1.000.840.67–1.06
 ≥20.81001620.60 0.43–0.830.74 0.52–1.05 ≥21.72453560.760.61–0.950.810.64–1.02
Recreational activityRecreational activity
 <1.52002501.0 1.0  <0.73394741.01.0
 1.5–3.9971181.00 0.72–1.400.91 0.64–1.29 0.7–2.62583021.170.94–1.461.080.86–1.36
 ≥4.01061151.12 0.80–1.551.02 0.72–1.46 ≥2.72502891.170.94–1.461.140.90–1.44
Total daily living activityfTotal daily living activityf
 <4.01641611.0 1.0 <4.33153541.01.0
 4.0–9.61531600.94 0.69–1.291.04 0.75–1.45 4.0–9.62743550.860.69–1.070.890.71–1.12
 ≥9.7861620.54 0.38–0.760.74 0.50–1.08 ≥9.72583560.860.68–1.070.980.77–1.25
Walking and bicyclingWalking and bicycling
 <0.21581601.0 1.0 <0.142753551.01.0
 0.2–0.51341620.84 0.61–1.150.75 0.53–1.05 0.14–0.422883531.030.82–1.290.980.78–1.23
 ≥0.61111610.72 0.52–1.010.73 0.51–1.03 ≥0.432843571.040.83–1.301.030.81–1.30
Strenuous household choresStrenuous household chores
 <3.31671611.0 1.0  <3.43223551.01.0
 3.3–7.31371600.81 0.59–1.120.88 0.62–1.24 3.4–7.82613540.790.64–0.990.880.70–1.12
 ≥7.4991620.60 0.43–0.840.81 0.53–1.24 ≥7.92643560.860.69–1.071.200.90–1.61
Strenuous outdoor choresStrenuous outdoor chores
 02372401.0 1.0 03914791.01.0
 0.1–1.1911220.75 0.54–1.050.82 0.58–1.15 0.1–0.92362930.960.77–1.190.970.77–1.21
 ≥1.2751210.64 0.46–0.910.81 0.56–1.18 ≥1.02202930.920.73–1.141.010.80–1.27
Mostly moderate or strenuous jobsMostly moderate or strenuous jobs
 02372501.0 1.0  04715131.01.0
 0.1–10.2901170.83 0.60–1.160.90 0.64–1.28 0.1–9.02002760.790.63–0.980.810.65–1.02
 ≥10.3761160.69 0.49–0.970.76 0.53–1.10 ≥9.11762760.710.56–0.890.700.55–0.88
  • a From menarche to reference year.

  • b Adjusted for age and race/ethnicity.

  • c Adjusted for age, race/ethnicity, country of birth, education, family history of breast cancer, prior biopsy for benign breast disease, age at menarche, parity, age at first full-term pregnancy, breast-feeding, BMI, and other components of total activity.

  • d Adjusted for age, race/ethnicity, country of birth, education, family history of breast cancer, age at menarche, parity, breast-feeding, age at menopause, and other components of total activity.

  • e Includes recreational activity, walking, bicycling, strenuous household and outdoor chores, and non-sedentary jobs.

  • f Includes walking, bicycling, and strenuous household and outdoor chores.