Table 1 displays the overall p-value and the number of significant markers across the genome according to the analysis method used (set of covariates analyzed). Including individual covariates did not necessarily lead to more significant loci identified as linked, and could even result in fewer significant findings of linkage compared to analyses with no covariates. However including a propensity score (such as with PS1 and PS3) can greatly increase the number of significant linkage results. Additionally, including the PS (except for PS2) did result in more significant regions of possible linkage compared with its corresponding multiple covariates method.
