Table 3.

Association of adult exercise/sport activity levels, occupational activity levels, BMI, energy intake and breast cancer risk between premenopausal and postmenopausal women (Shanghai Breast Cancer Study, 1996-1999)

BMI (kg/m2)
Energy intake (kcal/d)
Q1 (<21)Q2-Q3 (21 < BMI < 25)Q4 (>25)Q1 (<1,540)Q2-Q3 (1,540 < EI < 2,107)Q4 (>2,107)
All women
    Adult exercise/sports (MET-h/d/y)
        >2.921.01.07 (0.57-2.00)0.75 (0.38-1.47)1.00.83 (0.44-1.56)0.85 (0.43-1.69)
        0 < h ≤ 2.921.02 (0.51-2.05)1.22 (0.66-2.26)1.42 (0.74-2.74)1.06 (0.53-2.14)1.24 (0.67-2.31)1.05 (0.54-2.08)
        01.29 (0.74-2.23)1.68 (0.98-2.88)2.16 (1.25-3.74)1.52 (0.87-2.66)1.49 (0.86-2.59)1.87 (1.06-3.28)
        Pinteraction0.020.31
    Occupational activity (h/d/y)
        >41.01.13 (0.82-1.56)1.37 (0.97-1.94)1.01.01 (0.75-1.38)1.13 (0.80-1.59)
        0 < h ≤41.01 (0.72-1.41)1.41 (1.04-1.92)1.59 (1.13-2.23)1.16 (0.84-1.62)1.15 (0.86-1.54)1.35 (0.97-1.88)
        01.34 (0.86-2.09)1.73 (1.19-2.54)2.47 (1.57-3.88)1.63 (1.06-2.50)1.46 (1.01-2.11)1.82 (1.15-2.88)
        Pinteraction0.350.95
Premenopausal
    Adult exercise/sports (MET-h/d/y)
        >2.921.00.82 (0.33-2.03)0.74 (0.24-2.30)1.00.60 (0.19-1.88)0.58 (0.18-1.89)
        0 < h ≤ 2.920.65 (0.26-1.62)0.85 (0.36-2.00)0.54 (0.20-1.48)0.56 (0.18-1.78)0.57 (0.19-1.68)0.49 (0.15-1.54)
        00.81 (0.38-1.71)1.01 (0.48-2.12)1.11 (0.52-2.38)0.77 (0.28-2.10)0.67 (0.25-1.81)0.87 (0.32-2.39)
        Pinteraction0.170.37
    Occupational activity (h/d/y)
        >41.01.14 (0.79-1.65)1.09 (0.71-1.68)1.00.98 (0.67-1.44)1.20 (0.77-1.87)
        0 < h ≤ 40.94 (0.65-1.38)1.29 (0.91-1.83)1.31 (0.87-1.98)1.24 (0.82-1.86)1.01 (0.70-1.46)1.30 (0.85-1.97)
        01.55 (0.93-2.58)1.78 (1.13-2.80)2.25 (1.20-4.20)1.92 (1.12-3.29)1.57 (0.99-2.51)1.71 (0.92-3.19)
        Pinteraction0.440.37
Postmenopausal
    Adult exercise/sports (MET-h/d/y)
        >2.921.01.65 (0.65-4.19)1.19 (0.45-3.12)1.00.96 (0.43-2.13)0.90 (0.37-2.19)
        0 < h ≤ 2.921.68 (0.53-5.34)1.80 (0.69-4.68)3.30 (1.27-8.57)1.32 (0.51-3.43)1.85 (0.83-4.13)1.55 (0.64-3.77)
        02.07 (0.85-5.07)3.00 (1.28-7.05)4.74 (2.00-11.19)1.82 (0.87-3.79)2.51 (1.24-5.08)2.71 (1.31-5.63)
        Pinteraction0.120.34
    Occupational activity (h/d/y)
        >41.01.14 (0.57-2.28)1.94 (0.97-3.88)1.01.11 (0.66-1.85)1.01 (0.57-1.78)
        0 < h ≤ 41.26 (0.60-2.63)1.81 (0.92-3.57)2.17 (1.09-4.32)1.01 (0.56-1.81)1.51 (0.92-2.49)1.45 (0.84-2.51)
        00.97 (0.38-2.51)1.83 (0.85-3.94)3.13 (1.43-6.86)1.25 (0.60-2.59)1.36 (0.74-2.50)2.06 (1.04-4.08)
        Pinteraction0.640.34
  • NOTE: Data were adjusted for age at interview, education, income, history of fibroadenoma, history of breast cancer among first-degree relatives, ever had live birth, height, and menopausal status. Occupational activity was measured as the average time spent in standing or walking and classified into one of three activity categories (i.e., heavy, medium, or nonphysical work).