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. 2010 Nov;100(11):2288–2295. doi: 10.2105/AJPH.2009.180828

TABLE 4.

Occupational and Household Activity, Transportation Activity, and Sedentary Behavior in Relation to In Situ Breast Cancer Incidence Among Postmenopausal Women: National Institutes of Health–AARP Diet and Health Study, 1996–2003

No. Person-Years No. Cases Age-Adjusted RR (95% CI) Ptrend Multivariate 1 RR (95% CI)a Ptrend Multivariate 2 RR (95% CI)b Ptrend
Occupational and Household Activity
Routine activity during the day .333 .644 .79
    Sitting all day 49 144 39 1.00 1.00 1.00
    Sitting and a little walking 206 859 209 1.27 (0.90, 1.78) 1.26 (0.89, 1.78) 1.28 (0.91, 1.81)
    Standing or walking, no lifting 251 087 216 1.07 (0.76, 1.51) 1.08 (0.76, 1.53) 1.11 (0.78, 1.58)
    Lifting or carrying light loads, or climbing stairs often 115 128 98 1.06 (0.73, 1.54) 1.11 (0.76, 1.62) 1.15 (0.78, 1.68)
    Heavy lifting or carrying 9 775 8 1.03 (0.48, 2.19) 1.21 (0.56, 2.61) 1.25 (0.58, 2.68)
Transportation Activity
Years walked or biked to work .43 .57 .576
    < 1 555 972 511 1.00 1.00 1.00
    1–2 24 197 17 0.77 (0.47, 1.24) 0.77 (0.47, 1.25) 0.76 (0.47, 1.24)
    3–5 25 376 21 0.90 (0.58, 1.39) 0.92 (0.59, 1.42) 0.92 (0.59, 1.42)
    6–9 10 357 8 0.84 (0.42, 1.69) 0.87 (0.43, 1.75) 0.87 (0.43, 1.76)
    ≥ 10 16 090 13 0.88 (0.51, 1.52) 0.92 (0.53, 1.60) 0.92 (0.53, 1.61)
Sedentary Behavior
Television or video watching, h/day .427 .037 .063
    < 3 220 736 187 1.00 1.00 1.00
    3–4 272 210 247 1.07 (0.88, 1.29) 1.18 (0.97, 1.43) 1.16 (0.95, 1.41)
    5–6 103 031 103 1.18 (0.92, 1.50) 1.36 (1.06, 1.75) 1.32 (1.03, 1.71)
    7–8 18 990 21 1.30 (0.83, 2.05) 1.54 (0.98, 2.44) 1.50 (0.95, 2.38)
    ≥ 9 17 025 12 0.83 (0.46, 1.49) 1.04 (0.58, 1.88) 1.01 (0.56, 1.83)
Sitting, h/day .117 .244 .32
    < 3 136 447 104 1.00 1.00 1.00
    3–4 186 096 167 1.18 (0.92, 1.50) 1.15 (0.90, 1.47) 1.14 (0.89, 1.46)
    5–6 171 157 170 1.31 (1.02, 1.67) 1.26 (0.99, 1.61) 1.24 (0.97, 1.59)
    7–8 89 698 85 1.25 (0.94, 1.67) 1.19 (0.89, 1.60) 1.17 (0.88, 1.57)
    ≥ 9 48 594 44 1.20 (0.84, 1.72) 1.15 (0.80, 1.65) 1.12 (0.78, 1.61)

Note. RR = relative risk; CI = confidence interval. Person-years are rounded to the nearest whole number. The total number of participants was 97 039.

a

Adjusted for age, energy intake (kilocalories per day), recreational moderate–vigorous physical activity (0, 1–3, or ≥ 4 h/wk), parity or age at first live birth (never, < 20, < 25, < 30, or ≥ 30 years), menopausal hormone therapy use (never, current, or former), number of breast biopsies (0, 1, 2, or 3), smoking (ever or never), alcohol intake in grams per day (0, < 5, < 15, < 30, or ≥ 30), race (White, Black, or other), education (< 12 y, high school graduate, some college, or college graduate).

b

Adjusted for same covariates as in multivariate 1 plus body mass index (continuous).