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Table 3 Incidence of postmenopausal breast cancer and physical activity (PA) level at age 14, age 30 and at enrollment among 80,202 postmenopausal women from the Norwegian Women and Cancer Study

From: Physical activity and the risk of postmenopausal breast cancer - the Norwegian Women and Cancer Study

  PA level
  Very low Low Moderate High Very high P trend
At age 14       
N casesb 32 170 609 599 302  
RR (95% CI)a 0.77 (0.54, 1.10) 0.80 (0.68, 0.95) 1.0 (ref) 1.02 (0.91, 1.14) 1.04 (0.90, 1.19) 0.008
At age 30       
N casesb 34 206 746 548 189  
RR (95% CI)a 1.16 (0.82, 1.64) .99 (0.85, 1.16) 1.0 (ref) 0.97 (0.87, 1.09) 0.91 (0.78, 1.08) 0.23
At enrollment       
N cases 105 401 722 443 96  
RR (95% CI)a 1.06 (0.86, 1.30) 1.05 (0.93, 1.19) 1.0 (ref) 1.04 (0.92, 1.17) 0.91 (0.73, 1.12) 0.40
  1. aMultivariable model with RR and 95% CI used the attained age as the underlying time variable. Covariates adjusted for in the model were height, body mass index, smoking status, smoking duration (pack years), age at menarche, use of oral contraceptives, age at first birth, parity, use of hormone replacement therapy, self-reported disease and history of breast cancer in the participant’s mother.
  2. bThe total number of breast cancer does not add up due to by missing information on PA level at younger ages, age 14 to age 30 n = 77,272, age 14 to enrollment n = 77,623 and age 30 to enrollment n = 78,477.
  3. RR: relative risks; CI: confidence intervals.