Table 1.

Risk for breast cancer and socioeconomic and reproductive variables in Mexican women

Risk factorAll women (n = 1,866)
Premenopausal women (n = 875)
Postmenopausal women (n = 991)
Control (n = 1,391)Cases (n = 475)OR* (95% CI)Control (n = 699)Cases (n = 226)OR* (95% CI)Control (n = 692)Cases (n = 249)OR* (95% CI)
SES
    Low4231301.00191691.00232611.00
    Middle6952010.89 (0.69-1.15)356670.49 (0.33-0.74)3391341.39 (0.98-1.98)
    High2731441.58 (1.17-2.12)139531.04 (0.66-1.66)134912.22 (1.48-3.31)
P for trend0.0050.5030.000
Familial breast cancer
    No1,3654561.006771781.006882781.00
    Yes26191.95 (1.05-3.63)9114.18 (1.60-10.90)1781.07 (0.43-2.62)
Menopausal status
    Premenopausal6861891.00
    Postmenopausal7052860.71 (0.49-1.03)
Age (y) at first birth
    <205411391.00268621.00273771.00
    20-296132191.35 (1.05-1.73)336891.10 (0.75-1.60)2771301.58 (1.13-2.21)
    >2967821.61 (1.01-2.56)2990.95 (0.41-2.20)38262.01 (1.13-3.58)
    Nulliparous161811.64 (1.17-2.30)48292.26 (1.28-3.96)113521.48 (0.96-2.26)
    Missing915041
P for trend0.110.480.02
Parity
    0161811.0048291.00113521.00
    1-22651030.93 (0.64-1.36)189500.58 (0.32-1.06)76531.39 (0.85-2.29)
    3-43991320.83 (0.59-1.19)263600.44 (0.25-0.77)136721.18 (0.75-1.86)
    ≥55661590.61 (0.44-0.85)186500.40 (0.22-0.73)3801090.69 (0.46-1.03)
P for trend<0.001<0.001<0.001
  • * Adjusted by other variables and age, except age at first birth (colinearity).

  • Adjusted by other variables and age, except parity (colinearity).