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Table 3.

Correlation matrix of dietary isoflavones and fiber (non-starch polysaccharides) intake from 7-day food diaries and urinary and serum phytoestrogen levels (n = 284–333)

Dietary intake from 7-day food diaries
Daidzein (μg/day)Genistein (μg/day)Isoflavones (μg/day)Dietary fiber non-starch polysaccharides (g/d)
Urinary levels (μg/mmol creatinine) Isoflavones 0.26* 0.26* 0.270.00 
     Daidzein 0.260.27* 0.27* 0.03 
     Genistein 0.29* 0.290.30* −0.01 
     Glycitein 0.21* 0.21* 0.21* −0.06 
     O-DMA 0.17 0.19* 0.20* −0.04 
     Equol 0.09 0.10 0.10 −0.04 
 Lignans 0.05 0.06 0.06 0.17 
     Enterodiol 0.14 0.14 0.13 0.13 
     Enterolactone 0.06 0.07 0.07 0.29* 
Serum levels (ng/ml) Isoflavones 0.29* 0.31* 0.310.05 
     Daidzein 0.250.27* 0.27* 0.07 
     Genistein 0.29* 0.320.32* 0.05 
     Glycitein 0.12 0.12 0.12 −0.07 
     O-DMA 0.21* 0.23* 0.24* 0.00 
     Equol 0.14 0.15 0.15 0.04 
 Lignans 0.05 0.06 0.06 0.23
     Enterodiol 0.07 0.07 0.07 0.03 
     Enterolactone 0.03 0.04 0.04 0.22* 
Dietary intake from 7-day food diaries
Daidzein (μg/day)Genistein (μg/day)Isoflavones (μg/day)Dietary fiber non-starch polysaccharides (g/d)
Urinary levels (μg/mmol creatinine) Isoflavones 0.26* 0.26* 0.270.00 
     Daidzein 0.260.27* 0.27* 0.03 
     Genistein 0.29* 0.290.30* −0.01 
     Glycitein 0.21* 0.21* 0.21* −0.06 
     O-DMA 0.17 0.19* 0.20* −0.04 
     Equol 0.09 0.10 0.10 −0.04 
 Lignans 0.05 0.06 0.06 0.17 
     Enterodiol 0.14 0.14 0.13 0.13 
     Enterolactone 0.06 0.07 0.07 0.29* 
Serum levels (ng/ml) Isoflavones 0.29* 0.31* 0.310.05 
     Daidzein 0.250.27* 0.27* 0.07 
     Genistein 0.29* 0.320.32* 0.05 
     Glycitein 0.12 0.12 0.12 −0.07 
     O-DMA 0.21* 0.23* 0.24* 0.00 
     Equol 0.14 0.15 0.15 0.04 
 Lignans 0.05 0.06 0.06 0.23
     Enterodiol 0.07 0.07 0.07 0.03 
     Enterolactone 0.03 0.04 0.04 0.22* 

Note: Pearson correlation coefficients on log-transformed data. Correlation coefficients between dietary and urine and serum levels are indicated in bold of a particular phytoestrogens. Dietary fiber is used as a surrogate indicator of dietary lignan intake.

*P < 0.001.

P < 0.01.

P < 0.05.

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