Table 3.

Results of stratified analysis on the basis of study types, study populations and types of soy foods assessed

Combined risk estimate (95% CI)PTest of heterogeneity QPPublication biasReferences
All studies (n = 11)0.90 (0.79-1.03)0.13435.750.011Not detected(6, 7, 16-24)
Study types
    Cohort (n = 4)0.83 (0.66-1.05)0.1169.960.076Not detected(6, 7, 16, 17)
    Case-control (n = 7)0.95 (0.82-1.09)0.43820.790.107Not detected(18-24)
Study populations
    Asians (n = 8)0.91 (0.79-1.05)0.19133.160.070Not detected(6, 7, 17, 18, 20, 22-24)
    Non-Asians (n = 3)0.81 (0.60-1.11)0.1892.640.450Not detected(16, 19, 21)
Soy types
    Soy foods/products (n = 4)0.79 (0.62-1.00)0.04713.160.041Not detected(6, 7, 17, 23)
    Tofu (n = 6)0.97 (0.83-1.13)0.68918.690.096Not detected(16, 18-22)
    Miso (n = 6)0.89 (0.82-0.97)0.0088.0420.841Not detected(17, 18, 20, 22-24)
Study sites (isoflavone studies)
    Asian (n = 3)0.93 (0.76-1.15)0.4936.890.142Not detected(6, 7, 17)
    Western (n = 3)0.54 (0.29-1.04)0.06486.140.001Not detected(29-31)