Table 2. Modelling results of educational attainment in the UK Biobank.

	Full sample
	Unweighted PRS			Weighted PRS
	Estimate	Std Error	p-value	Estimate	Std Error	p-value
Offspring effect	0.026	0.005	3.18 × 10 -7	2.474	0.485	3.40 × 10 -7
Prenatal maternal effect	0.027	0.011	0.013	1.722	0.703	0.014
Postnatal maternal effect	–0.006	0.008	0.484	–0.288	0.514	0.575
Postnatal paternal effect	0.018	0.007	0.006	1.233	0.678	0.069
	Excluding adopted individuals with breastfeeding information
	Unweighted PRS			Weighted PRS
	Estimate	Std Error	p-value	Estimate	Std Error	p-value
Offspring effect	0.025	0.005	5.52 × 10–7	2.441	0.372	5.15 × 10–11
Prenatal maternal effect	0.017	0.012	0.140	0.909	0.705	0.197
Postnatal maternal effect	0.004	0.009	0.682	0.549	0.595	0.357
Postnatal paternal effect	0.019	0.007	0.005	1.273	0.552	0.021

PRS: polygenic risk score constructed using 1,267 SNPs from Lee et al., 2018; Std Error: standard error.