Table 4. Results of the linear regression testing the association between IGF2BP1 DNA methylation level and the familial and unique environmental factors of both BW and WM.

	β	SE	t	Pr(>|t|)
Birth weight
Familial factors (βB)	89.4×10−3	0.084	1.061	0.299
Unique environment (βW)	70.9×10−3	0.039	1.794	0.085
Working memory
Familial factors (βB)	9.8×10−3	0.003	−3.669	0.001
Unique environment (βW)	−2.9×10−3	0.002	−1.785	0.086

Mean methylation percentage of cg07075026 and cg20966754 was used as outcome. Analyses were adjusted for gender, age, weeks of gestation and IQ, and accounted for correlated responses from twin pairs using a mixed effects model. BW was introduced in kilograms and WM in standard units. SE: Standard error.