The QA/QC Report for the Add Health Sibling Pairs Sample is provided in the Supplemental Materials. Briefly, there we describe how the sample was selected, prepared and genotyped, the number of markers removed, the number of samples removed, sex checks and duplicate concordance. The number of individual samples deemed of high quality for subsequent relationship testing, ancestry estimation and genome-wide analysis is N=1,888. The number of SNP markers (chromosomes 1-22 and X) with a genotyping call rate of at least 95% is N=940,862.
