Table 1.- Variants (SNPs) included in the PRS calculation
(Disease/Trait: Periodontitis)
rsID	Risk allele	Effect size
rs2392510	T	0.140
rs9446777	G	0.199
Effect size: LN(OR)

Table 2.- PRS Score distribution among populations and regions
(Disease/Trait: Periodontitis)
	count	mean	sd	se	lower.ci	upper.ci
Pyrenean regions
WEST	168	0.028	0.023	0.002	0.024	0.031
SOUTH	83	0.036	0.027	0.003	0.030	0.041
EAST	146	0.035	0.026	0.002	0.031	0.039
Populations
IBS	107	0.035	0.026	0.003	0.030	0.040
PIR	397	0.032	0.025	0.001	0.030	0.035

Table 3.- Pairwise t-test for PRS score among populations and regions
(Disease/Trait: Periodontitis)
group1	group2	n1	n2	p	p.signif	p.adj	p.adj.signif
IBS	PIR	107	397	0.22500	ns	1.0000	ns
IBS	WEST	107	168	0.01360	*	0.1360	ns
IBS	SOUTH	107	83	0.97000	ns	1.0000	ns
IBS	EAST	107	146	0.93200	ns	1.0000	ns
WEST	SOUTH	168	83	0.02050	*	0.2050	ns
WEST	EAST	168	146	0.00925	**	0.0925	ns
SOUTH	EAST	83	146	0.90600	ns	1.0000	ns
* p < .05, ** p < .01, *** p < .001

Table 4.- Chi-square test comparison of percentile counts on Pyrenean regions compared to Iberian peninsula population
(Disease/Trait: Periodontitis)
Percentile rank	PIR				WEST				SOUTH				EAST
	adj.std.val	p.value	sig.val		adj.std.val	p.value	sig.val		adj.std.val	p.value	sig.val		adj.std.val	p.value	sig.val
pct95	−0.640	0.522	.	white	−2.570	0.010	*		−0.640	0.522	.	white	−1.900	0.057	.	white
pct75.95	0.310	0.757	.	white	−1.110	0.267	.	white	0.310	0.757	.	white	1.490	0.136	.	white
pct50.75	0.000	1.000	.	white	0.000	1.000	.	white	0.000	1.000	.	white	0.000	1.000	.	white
pct25.50	−0.110	0.912	.	white	0.060	0.952	.	white	−0.110	0.912	.	white	−0.970	0.332	.	white
pct25	0.160	0.873	.	white	1.700	0.089	.	white	0.160	0.873	.	white	0.430	0.667	.	white
adj.std.val: Adjusted standardized residuals value; p.value: P value; sig.val: statistical significance, * p < .05, ** p < .01, *** p < .001; red dash to bottom: lower counts than reference; green dash to up: upper counts than reference