Markers with significant linkage evidence according to the method of analysis. The yellow bars represent markers significant at the 0.05 level, and the red bars represent markers significant at the 0.01 level. The marker numbers correspond to 315 microsatellite markers throughout the genome, and are separated into chromosomes 1 through 22. The method number corresponds to the set of covariates analyzed as listed in Table 1, and is separated by the type of method used. From bottom to top, the methods are no covariates, single covariates, propensity scores, and multiple covariates.