Figure 1From: Progress in spondylarthritis. Progress in studies of the genetics of ankylosing spondylitisSample size requirements for genomewide scans. Sample size (number of cases, assuming equal number of controls) to achieve 80% power at α = 5 × 10-7, assuming D' = 0.8 and that the minor allele frequency of the marker SNPs and disease-associated variants are equal. MAF, minor allele frequency.Back to article page