Table 2.

Variance component linkage analysis of the waist circumference in cm of the 200 Italian families by Merlin software

Quantitative trait	Families	Trait heritability	Gene trait heritability	Lod score	P-value	Empirical P-value
Waist in cm	108	50.66%	49.17%	0.93	0.020	0.023

Families = families number analyzed; Lod score = derived from the quantitative trait analysis by Merlin; Empirical P-value = derived from 1000 replicates by using the gene dropping method; Trait Heritability = Heritability of the quantitative trait calculated by Merlin; Trait Heritability attributable to the PSMD9 SNPs.