Table 3.

HRs for invasive breast cancer according to levels of recreational physical activity within the previous 4 years

No. of casesMultivariable HRa95% CI
Walking (MET-h/wk)
 <64531.00(reference)
 6 to <124760.840.74–0.96
 12 to <246450.870.77–0.98
 ≥245230.930.82–1.06
Ptrendb0.93
 <64531.00(reference)
 ≥61,6440.880.79–0.98
Cycling and other sports (MET-h/wk)
 08531.00(reference)
 >0 to <124680.940.84–1.06
 12 to <244520.940.84–1.06
 ≥243240.990.87–1.12
Ptrendb0.66
 08531.00(reference)
 >01,2440.950.87–1.04
Total recreational physical activity (MET-h/wk)
 <125211.00(reference)
 12 to <245670.860.76–0.97
 24 to <364400.920.81–1.05
 ≥365690.930.83–1.05
Ptrendb0.69
 <125211.00(reference)
 ≥121,5760.900.82–0.99

NOTE: Fifty-eight breast cancer cases occurred among women with missing information on level of recreational physical activity within the previous 4 years. E3N Cohort, 1993–2005 (n = 59,308).

  • aAdjusted for age (time scale), family history of breast cancer in first-degree relatives, age at menarche, parity and age at first full-term pregnancy, BMI, history of benign breast disease, age at menopause, use of menopausal hormone therapy, total energy intake excluding alcohol, and alcohol intake. Further stratified by year of birth. See Table 1 for categories/cutoffs used. Walking and cycling/sports activities are mutually adjusted.

  • bTests for linear trends were performed with level of recreational physical activity (in MET-h/wk) as a continuous variable.