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Table 4 Epidemiological parameters estimated from 1.8 million simulated sibling pairs

From: Genetic Analysis Workshop 15: simulation of a complex genetic model for rheumatoid arthritis in nuclear families including a dense SNP map with linkage disequilibrium between marker loci and trait loci

Parameter  
RA lifetime prevalence 1.07%
F:M sex ratio in affecteds 3.07
Sibling relative risk 9.03
Number of ASPs 1856 (of 1.8 million sibling pairs)