A1298C AA vs. CC OR(95% CI )   P value   AC vs. AA OR(95% CI ) P value CC vs. AA+AC OR(95% CI ) P value AC+CC vs. AA OR(95% CI ) P value
Total 1.428(1.016,1.849) 0.0067 0.9649(0.9208,1.122) 0.6432 0.6894(0.5686,0.8849) 0.6481 1.039(0.9496,1.198) 0.6012
Caucasian 1.583(0.9264,1.560) 0.3759 1.280(1.015,1.591) 0.0257 1.803(1.033,2.509) 0.0004 1.111(0.9591,1.138) 0.3185
Brazilian 0.6955(0.9264,1.560) 0.3759 1.192(0.942,1.644) 0.2845 00.6481(0.9519,1.455) 0.2827  1.025(0.8575,1.350) 0.8615
Asian 0.8891(0.9304,1.470) 0.6464 1.00(0.9058,1.345) 1.00  0.8891(0.9519,1.455) 0.6399   0.8834(0.7791,1.2071) 0.4360
Table 4: ORs and 95% CI for Down syndrome and the MTHFR A1298C polymorphism under different genetic models.