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Table 4 Relative risk (RR) and 95% confidence intervals (CI) for the association of light physical activity during four periods of life with breast cancer incidence: 118,899 postmenopausal women in the NIH-AARP Diet and Health Study

From: Intensity and timing of physical activity in relation to postmenopausal breast cancer risk: the prospective NIH-AARP Diet and Health Study

Light activity No.
cancers*
n = 4287
RR 95%
CI
RR†† 95%
CI
RR§ 95%
CI
RR£ 95%
CI
Ages 15-18 years             
   Never/Rarely 358 1.00 (ref.)   1.00 (ref.)    1.00 (ref.)    1.00 (ref.)   
   <1 hour/week 344 1.09 0.94, 1.27 1.09 0.94 1.26 1.07 0.92 1.24 1.09 0.94 1.26
   1-3 hours/week 974 1.06 0.94, 1.20 1.05 0.93 1.19 1.04 0.92 1.18 1.05 0.93 1.18
   4-7 hours/week 982 1.08 0.96, 1.22 1.08 0.95 1.22 1.07 0.95 1.22 1.07 0.95 1.21
   >7 hours/week 1553 1.03 0.92, 1.16 1.05 0.94 1.18 1.05 0.93 1.19 1.04 0.93 1.17
Ages 19-29 years             
   Never/Rarely 199 1.00 (ref.)   1.00 (ref.)    1.00 (ref.)    1.00 (ref.)   
   <1 hour/week 249 1.18 0.98, 1.42 1.16 0.97 1.40 1.15 0.95 1.38 1.16 0.96 1.40
   1-3 hours/week 793 1.14 0.98, 1.34 1.11 0.95 1.30 1.10 0.94 1.29 1.11 0.95 1.30
   4-7 hours/week 1036 1.13 0.97, 1.32 1.12 0.96 1.30 1.11 0.95 1.30 1.11 0.96 1.30
   >7 hours/week 1940 1.05 0.91, 1.21 1.07 0.93 1.24 1.07 0.92 1.25 1.07 0.92 1.24
Ages 35-39 years             
   Never/Rarely 171 1.00 (ref.)   1.00 (ref.)    1.00 (ref.)    1.00 (ref.)   
   <1 hour/week 238 1.19 0.98, 1.44 1.17 0.96 1.42 1.14 0.94 1.40 1.16 0.95 1.41
   1-3 hours/week 811 1.19 1.01, 1.41 1.15 0.98 1.36 1.15 0.97 1.36 1.15 0.98 1.36
   4-7 hours/week 1036 1.08 0.92, 1.27 1.05 0.89 1.24 1.04 0.88 1.23 1.05 0.91 1.24
   >7 hours/week 1952 1.05 0.90, 1.23 1.06 0.90 1.24 1.06 0.90 1.24 1.06 0.91 1.24
Past 10 years             
   Never/Rarely 183 1.00 (ref.)   1.00 (ref.)    1.00 (ref.)    1.00 (ref.)   
   <1 hour/week 266 1.23 1.02, 1.48 1.21 1.00 1.46 1.19 0.98 1.44 1.21 1.00 1.46
   1-3 hours/week 890 1.13 0.96, 1.32 1.08 0.92 1.27 1.10 0.93 1.29 1.09 0.93 1.28
   4-7 hours/week 1264 1.20 1.02, 1.40 1.14 0.98 1.34 1.19 1.01 1.39 1.16 0.99 1.36
   >7 hours/week 1634 1.04 0.89, 1.21 1.01 0.87 1.18 1.09 0.92 1.28 1.04 0.89 1.21
  1. * Number of cancer cases may not add up to total (n = 4287) due to missing physical activity values
  2. † Relative risks adjusted for age (continuous)
  3. †† 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)
  4. §Relative risks additionally adjusted for frequency of other type of physical activity (either light or moderate-to-vigorous) during that same time period
  5. £ Relative risks additionally adjusted for body mass index (BMI: <25.0, 25.0-29.9, 30.0-34.9, ≥ 35.0 kg/m2)