C677T TT vs. CC OR(95% CI ) P value CT vs. CC OR(95% CI ) P value TT vs. CC+CT OR(95% CI ) P value TT+CT vs. CC OR(95% CI ) P value
Total 2.991(1.321,3.558) 0.0001 1.616(1.216,1.845) 0.0001 0.6235(0.5671,0.7474) <0.0001 0.7528(0.8115,0.8503) 0.0001
Caucasian 1.709(1.083 ,1.209) <0.0001 0.6506(0.7610,08841) <0.0001 2.084(1.084,2.574) <0.0001 1.167(1.003,1.354) 0.0409
Brazilian 0.3419 (0.8648,1.489) 0.1365 0.3419 (0.7404) 0.0002 0.4171(0.9009) 0.2282 2.925(1.305,6.031) 0.0029
Asian 0.6790(0.8198,1.004) 0.0557 0.6298 (0.7404,0.915) 0.0002 0.8249(0.9442,1.211) 0.3249 1.563(1.120,1.970) 0.0001
Table 3: ORs and 95% CI for Down syndrome and the MTHFR C677T polymorphism under different genetic models.