The Illumina HumanOmni1-Quad v1.0 BeadChips were used to genotype 1.1 million single nucleotide polymorphisms (SNPs) in 815 children enrolled in the VIVA LA FAMILIA Study. Genotype calls were obtained after scanning on the Illumina BeadStation 500GX and analysis using the GenomeStudio software. Our genotyping error rate (based on duplicates) was 2 per 100,000 genotypes. Illumina has included sample-dependent and -independent controls on their BeadChips to test for accuracy of the procedure. The average call rate for all SNPs per individual sample was 97%.
