Subjects were genotyped on Illumina (n = 84 studies) or Affymetrix genotyping arrays (n = 5 studies) (Supplementary Table 1). Studies that provided direct access to pre-quality control genotype data (n = 64 studies) were deposited on the LISA server for central processing and analysis by the PGC-PTSD analyst. Studies with data sharing restrictions (n = 24 studies) were processed and analyzed following their own site-specific protocols (Supplementary Table 28) and shared GWAS summary statistics for inclusion in meta-analysis.