Table 1.- Variants (SNPs) included in the PRS calculation
(Disease/Trait: Asthma_and_hay_fever)
rsID	Risk allele	Effect size
rs4833095	T	0.182
rs1438673	C	0.148
rs10197862	A	0.215
rs7212938	G	0.148
rs17294280	G	0.166
rs62026376	C	0.157
Effect size: LN(OR)

Table 2.- PRS Score distribution among populations and regions
(Disease/Trait: Asthma_and_hay_fever)
	count	mean	sd	se	lower.ci	upper.ci
Pyrenean regions
WEST	168	0.101	0.021	0.002	0.098	0.104
SOUTH	83	0.097	0.023	0.003	0.092	0.102
EAST	146	0.102	0.022	0.002	0.098	0.106
Populations
IBS	107	0.101	0.022	0.002	0.097	0.105
PIR	397	0.101	0.022	0.001	0.098	0.103

Table 3.- Pairwise t-test for PRS score among populations and regions
(Disease/Trait: Asthma_and_hay_fever)
group1	group2	n1	n2	p	p.signif	p.adj	p.adj.signif
IBS	PIR	107	397	0.781	ns	1	ns
IBS	WEST	107	168	0.904	ns	1	ns
IBS	SOUTH	107	83	0.236	ns	1	ns
IBS	EAST	107	146	0.792	ns	1	ns
WEST	SOUTH	168	83	0.238	ns	1	ns
WEST	EAST	168	146	0.668	ns	1	ns
SOUTH	EAST	83	146	0.132	ns	1	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: Asthma_and_hay_fever)
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	−1.550	0.121	.	white	−1.180	0.238	.	white	−1.550	0.121	.	white	−0.410	0.682	.	white
pct75.95	0.480	0.631	.	white	0.270	0.787	.	white	0.480	0.631	.	white	−0.570	0.569	.	white
pct50.75	−0.270	0.787	.	white	−0.260	0.795	.	white	−0.270	0.787	.	white	0.960	0.337	.	white
pct25.50	0.120	0.904	.	white	1.260	0.208	.	white	0.120	0.904	.	white	0.730	0.465	.	white
pct25	0.490	0.624	.	white	−0.670	0.503	.	white	0.490	0.624	.	white	−0.990	0.322	.	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