Bivariate GCTA estimates of the genetic and residual correlations for bone mineral density measurements at the total-body less head, lower limb, upper limb and skull for the ALSPAC cohort.

TBLH-BMD = total body less head BMD, (LL-BMD) = lower limb BMD, (UL-BMD) = upper limb BMD, (SK-BMD) = skull BMD, rg = genetic correlation between trait 1 and trait 2. re = residual correlation between trait 1 and trait 2. All traits, excluding SK-BMD were adjusted for age, gender and weight. SK-BMD was adjusted for age, gender and height. P-refers to the P-value for the likelihood ratio test of whether rg = 0. Phenotypic correlations (rp) were as follows: SK-BMD/TBLH-BMD (rp = 0.40, SE = 0.013, P<0.001), SK-BMD/LL-BMD (rp = 0.31, SE = 0.013, P<0.001), SK-BMD/UL-BMD (rp = 0.40, SE = 0.013, P<0.001) and LL-BMD/UL-BMD (rp = 0.64, SE = 0.010, P<0.001).