Association of maternal TCN2 haplotypes with vitamin B-12 cord blood levels and offspring IQ at age 8.

ap-value for testing the effect of each haplotype vs all others.bp-value for the omnibus test that compares the alternate model (each haplotype having a unique effect) vs the null model (no haplotypes having any effect).cN corresponds to the number of mothers with available genotype data for both SNPs (N = 5866), whose children had vitamin B-12 measured in cord blood (N = 202), or whose children had been IQ tested (N = 3429).