Table 3.

Adjusteda β-coefficients for continuous, energy-adjusted isoflavone intake (mg) and adjusted means by isoflavone intake categoryb for dense area, nondense area, and percent breast density, in all participants and stratified on equol-producing status among Chinese immigrant women (n = 221)

All participants (n = 221)Equol nonproducer (n = 147)Equol producer (n = 74)Interaction P
Dense area (cm2)
 β (SE)−0.01 (0.06)0.06 (0.08)0.24 (0.10)0.046
  P0.810.450.02
 Mean (95% CI)
  Low isoflavone intake35.8 (28.3–43.3)37.7 (29.8–45.5)35.5 (27.4–43.6)0.18
  High isoflavone intake35.0 (27.8–42.1)38.3 (30.8–45.9)30.4 (22.4–38.4)
  P0.680.07c
Nondense area (cm2)
 β (SE)0.09 (0.09)0.06 (0.11)0.16 (0.14)0.67
  P0.330.620.28
 Mean (95% CI)
  Low isoflavone intake62.6 (52.2–73.1)65.4 (54.4–76.6)58.8 (47.3–70.3)0.21
  High isoflavone intake64.2 (54.1–74.2)64.3 (53.6–75.0)65.2 (53.9–76.6)
  P0.590.41
Percent density
 β (SE)−0.03 (0.05)0.03 (0.06)0.22 (0.09)0.05
  P0.470.650.02
 Mean (95% CI)
  Low isoflavone intake34.2 (28.6–39.8)35.3 (29.5–41.1)34.5 (28.5–40.5)0.07
  High isoflavone intake33.2 (27.8–38.5)35.9 (30.3–41.5)29.3 (23.4–35.2)
  P0.510.04
  • aLinear regression models adjusted for age, image modality (digital or film), energy intake (kcal), education category, months of breastfeeding, BMI, waist circumference, and a combined variable representing number of live births and age at first live birth.

  • bEnergy-adjusted isoflavone intake dichotomized at median.

  • cRepresents P for four-category variables representing cross-classification by equol-producing status and dichotomized isoflavone intake.