Table 3.

Heritability and genetic correlation of PFS and SMS caries scores

Phenotype	n	PFS				SMS				Shared genetics
		h2	SE	pa	R2	h2	SE	pb	R2	rhoG	SE	prhoG=0c	prhoG=1d
Primary dentition
dfs	953	0.34	0.10	3 × 10−4	0.01	0.42	0.10	2 × 10−5	0.00	0.76	0.08	0.001	9 × 10−4
Proportion dfs	953	0.53	0.11	2 × 10−6	0.04	0.42	0.10	2 × 10−5	0.00	0.93	0.08	5 × 10−6	0.208
Permanent dentition
DMFS	1,939	0.27	0.06	7 × 10−6	0.35	0.27	0.07	2 × 10−4	0.22	1.00	–	2 × 10−6	1.000
Proportion DMFS	1,939	0.37	0.06	2 × 10−11	0.33	0.21	0.06	2 × 10−4	0.21	0.98	0.08	5 × 10−9	0.424
Total dentition
dfs + DMFS	2,378	0.19	0.04	2 × 10−6	0.28	0.17	0.04	1 × 10−5	0.17	1.00	–	1 × 10−7	1.000
Proportion dfs + DMFS	2,378	0.31	0.04	2×10−13	0.35	0.23	0.04	2 × 10−8	0.19	0.99	0.06	6 × 10−13	0.422

h² = Residual heritability after adjusting for sex and age; SE = standard error, not applicable for models that converged at rho_G = 1.00; R² = proportion of trait variance attributable to sex and age; rho_G = genetic correlation, i.e. a measure of the extent to which traits covary due to genes.

^a p value that PFS caries is heritable.

^b p value that SMS caries is heritable.

^c p value that shared genetic risk factors affect both PFS and SMS.

^d p value that unshared genetic risk factors differentially affect PFS and SMS.