Table 5 Univariate estimates of chip-heritability for pre-natal phenotypes and their genetic correlation with number of O-levels.

	N	Genetic			Genetic correlation with number of O-levels
	N	heritability ()	se	P-value	Corr (r_g)	se	P-value*
Father’s age (years)	5,100	0.03	0.06	0.31	−0.95	1.31	0.11
Mother’s age (years)	5,255	0.03	0.06	0.31	−0.89	1.24	0.12
Mother’s weight (kg)	5,152	0.15	0.06	0.010	0.05	0.37	0.44
Father’s height (cm)	4,535	0.22	0.07	0.001	0.38	0.31	0.12
Mother’s height (cm)	5,054	0.12	0.07	0.03	0.14	0.41	0.37
Age father left school (years)	5,078	0.07	0.07	0.13	1.00	0.61	0.03
Age mother left school (years)	4,124	0.07	0.08	0.19	1.00	0.64	0.03
Average age parent’s left school (years)	3,874	0.02	0.08	0.39	1.00	1.12	0.50
Male	5,458	0.05	0.06	0.20	−0.80	0.74	0.09
Mother smoked	5,245	0.05	0.06	0.19	0.23	0.63	0.35
Mother smoked during pregnancy	5,197	0.10	0.06	0.04	0.02	0.43	0.48
Father high social class	5,023	0.23	0.07	<0.001	0.87	0.32	0.002
Paternal grandfather high social class	4,409	0.07	0.08	0.18	0.39	0.64	0.27
Maternal grandfather high social class	4,367	0.21	0.08	0.003	0.64	0.36	0.03

Estimated using GCTA. *P-value from one-sided likelihood ratio test of the hypothesis r_g = 0. All parameters adjusted for first twenty principle components of the genetic relatedness matrix and an indicator variable for the GWAS sample.

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