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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         
 <1046 66 72 1.0  20 15 1.0  
 1047–1678 81 69 1.2 0.77–2.0 31 22 1.1 0.45–2.5 
 1679–2739 85 60 1.4 0.89–2.4 38 34 0.81 0.36–1.8 
 2740–7285 47 53 0.89 0.51–1.5 57 48 0.86 0.40–1.9 
 ≥7286 17 35 0.49 0.25–0.99 64 69 0.67 0.40–1.9 
 Trend across quintiles   P = 0.09    P = 0.17  
Total Lignans         
 <64.6 77 62 1.0  32 29 1.0  
 64.7–90.7 68 62 0.85 0.52–1.4 44 35 1.1 0.53–2.1 
 90.8–120.9 56 57 0.74 0.44–1.2 50 37 1.1 0.54–2.1 
 121.0–160.9 52 55 0.70 0.41–1.2 40 43 0.70 0.34–1.4 
 ≥161.0 43 53 0.55 0.31–0.98 44 44 0.65 0.29–1.4 
 Trend across quintiles   P = 0.03    P = 0.13  
Phytoestrogen (μg/day)White womenAsian women
CasesControlsORa95% CICasesControlsORa95% CI
Total Isoflavones         
 <1046 66 72 1.0  20 15 1.0  
 1047–1678 81 69 1.2 0.77–2.0 31 22 1.1 0.45–2.5 
 1679–2739 85 60 1.4 0.89–2.4 38 34 0.81 0.36–1.8 
 2740–7285 47 53 0.89 0.51–1.5 57 48 0.86 0.40–1.9 
 ≥7286 17 35 0.49 0.25–0.99 64 69 0.67 0.40–1.9 
 Trend across quintiles   P = 0.09    P = 0.17  
Total Lignans         
 <64.6 77 62 1.0  32 29 1.0  
 64.7–90.7 68 62 0.85 0.52–1.4 44 35 1.1 0.53–2.1 
 90.8–120.9 56 57 0.74 0.44–1.2 50 37 1.1 0.54–2.1 
 121.0–160.9 52 55 0.70 0.41–1.2 40 43 0.70 0.34–1.4 
 ≥161.0 43 53 0.55 0.31–0.98 44 44 0.65 0.29–1.4 
 Trend across quintiles   P = 0.03    P = 0.13  
a

Adjusted for age and daily caloric intake.

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