Table 5

Relative risk (RR) and 95% confidence intervals (CI) for the association of moderate-to-vigorous physical activity during four periods of life with breast cancer incidence: 118,899 postmenopausal women in the NIH-AARP Diet and Health Study

Moderate-to-vigorous activity

No.

cancers*

n = 4287

RR

95%

CI

RR††

95%

CI

RR§

95%

CI

RR£

95%

CI


Ages 15-18 years

Never/Rarely

541

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

<1 hour/week

394

1.11

0.98, 1.27

1.12

0.98

1.27

1.10

0.97

1.26

1.12

0.98

1.27

1-3 hours/week

936

1.05

0.95, 1.17

1.05

0.94

1.17

1.04

0.93

1.16

1.05

0.94

1.16

4-7 hours/week

950

1.02

0.92, 1.14

1.01

0.91

1.13

1.00

0.89

1.12

1.01

0.91

1.13

>7 hours/week

1415

1.02

0.92, 1.12

1.03

0.93

1.14

1.02

0.91

1.14

1.02

0.93

1.13

Ages 19-29 years

Never/Rarely

415

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

<1 hour/week

384

1.09

0.95, 1.25

1.08

0.94

1.24

1.07

0.93

1.23

1.08

0.94

1.24

1-3 hours/week

976

1.07

0.95, 1.20

1.06

0.94

1.19

1.05

0.93

1.18

1.06

0.94

1.19

4-7 hours/week

1080

1.00

0.89, 1.12

1.01

0.90

1.13

1.01

0.89

1.13

1.01

0.90

1.13

>7 hours/week

1375

0.97

0.87, 1.08

1.01

0.90

1.13

1.02

0.90

1.15

1.01

0.90

1.13

Ages 35-39 years

Never/Rarely

392

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

<1 hour/week

421

1.12

0.98, 1.28

1.11

0.97

1.27

1.09

0.95

1.25

1.11

0.97

1.27

1-3 hours/week

963

1.00

0.89, 1.13

0.99

0.88

1.11

0.98

0.87

1.11

0.99

0.88

1.12

4-7 hours/week

1174

1.03

0.92, 1.16

1.03

0.92

1.15

1.04

0.92

1.18

1.04

0.93

1.16

>7 hours/week

1288

0.94

0.84, 1.06

0.97

0.87

1.09

0.99

0.87

1.12

0.98

0.88

1.10

Past 10 years

Never/Rarely

646

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

1.00 (ref.)

<1 hour/week

507

1.06

0.94, 1.19

1.05

0.94

1.18

1.03

0.92

1.16

1.06

0.94

1.19

1-3 hours/week

1071

0.93

0.84, 1.02

0.91

0.83

1.00

0.90

0.81

1.00

0.93

0.84

1.02

4-7 hours/week

1106

0.94

0.86, 1.04

0.92

0.83

1.01

0.91

0.82

1.01

0.94

0.85

1.04

>7 hours/week

928

0.84

0.76, 0.93

0.84

0.76

0.93

0.85

0.76

0.95

0.87

0.78

0.96


Number of cancer cases may not add up to total (n = 4287) due to missing physical activity values

† Relative risks adjusted for age (continuous)

†† Relative risks adjusted for: age (continuous); race/ethnicity (white, black, Hispanic, Asian/Pacific Islander/American Indian); education level (<12 years or high school equivalent, 12 years or high school equivalent, post-high school vocational or technical training, some college, college graduate, post-graduate); smoking status (non-smoker, former, current); alcohol intake (grams/day, quintiles adjusted for total energy intake); family history of breast cancer (no, yes); age at menarche (<13, 13-14, ≥ 15 years); age at first birth (nulliparous, <20, 20-24, 25-29, 30+ years); parity (number of children: 0, 1-2, 3 or more); age at menopause (<40, 40-44, 45-49, 50-54, ≥ 55 years); menopausal hormone use (never, ever)

§Relative risks additionally adjusted for frequency of other type of physical activity (either light or moderate-to-vigorous) during that same time period

£ Relative risks additionally adjusted for body mass index (BMI: <25.0, 25.0-29.9, 30.0-34.9, ≥ 35.0 kg/m2)

Peters et al. BMC Cancer 2009 9:349   doi:10.1186/1471-2407-9-349

Open Data