Table 4

Phytoestrogen consumption and thyroid cancer risk among white and Asian women participating in the Bay Area Thyroid Cancer Study

Phytoestrogen (μg/day)White womenAsian women
CasesControlsORa95% CICasesControlsORa95% CI
Total Isoflavones
 <104666721.020151.0
 1047–167881691.20.77–2.031221.10.45–2.5
 1679–273985601.40.89–2.438340.810.36–1.8
 2740–728547530.890.51–1.557480.860.40–1.9
 ≥728617350.490.25–0.9964690.670.40–1.9
 Trend across quintilesP = 0.09P = 0.17
Total Lignans
 <64.677621.032291.0
 64.7–90.768620.850.52–1.444351.10.53–2.1
 90.8–120.956570.740.44–1.250371.10.54–2.1
 121.0–160.952550.700.41–1.240430.700.34–1.4
 ≥161.043530.550.31–0.9844440.650.29–1.4
 Trend across quintilesP = 0.03P = 0.13
  • a Adjusted for age and daily caloric intake.