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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.