Scientific Reports

Table 3 The proportions of educational variation explained by additive genetic, shared environmental and unique environmental variances with 95% confidence intervals by birth cohort and cultural–geographic region in men and women.

From: Genetic and environmental variation in educational attainment: an individual-based analysis of 28 twin cohorts

	Additive genetic factors			Shared environment			Unique environment
	a²	95% CI		c²	95% CI		e²	95% CI
	a²	LL	UL	c²	LL	LL	e²	LL	UL
Europe
All	0.40	0.37	0.42	0.35	0.33	0.37	0.26	0.25	0.26
1900–1909	0.21	0.05	0.36	0.58	0.44	0.70	0.22	0.17	0.28
1910–1919	0.34	0.24	0.44	0.42	0.33	0.50	0.25	0.21	0.28
1920–1929	0.30	0.23	0.37	0.44	0.38	0.50	0.26	0.24	0.28
1930–1939	0.34	0.28	0.40	0.36	0.31	0.41	0.29	0.27	0.31
1940–1949	0.43	0.38	0.47	0.30	0.26	0.34	0.27	0.26	0.29
1950–1959	0.40	0.36	0.44	0.37	0.33	0.40	0.24	0.22	0.25
1960–1969	0.31	0.18	0.45	0.36	0.23	0.48	0.33	0.30	0.36
1970–1979	0.48	0.40	0.57	0.23	0.14	0.31	0.29	0.27	0.31
1980–1989	0.69	0.48	0.75	0.02	0.00	0.22	0.29	0.25	0.33
North America and Australia
All	0.39	0.36	0.41	0.32	0.30	0.29	0.29	0.28	0.30
1900–1909	0.17	0.00	0.41	0.55	0.33	0.72	0.28	0.21	0.37
1910–1919	0.47	0.38	0.57	0.34	0.24	0.43	0.19	0.17	0.21
1920–1929	0.50	0.44	0.55	0.26	0.21	0.32	0.24	0.23	0.25
1930–1939	0.43	0.34	0.53	0.29	0.19	0.38	0.28	0.26	0.30
1940–1949	0.42	0.35	0.48	0.29	0.23	0.35	0.30	0.28	0.31
1950–1959	0.33	0.28	0.38	0.34	0.29	0.39	0.33	0.31	0.34
1960–1969	0.29	0.23	0.36	0.35	0.29	0.41	0.36	0.34	0.38
1970–1979	0.21	0.14	0.30	0.43	0.36	0.50	0.35	0.33	0.38
1980–1989	0.59	0.45	0.72	0.12	0.00	0.25	0.29	0.27	0.32
East Asia
All	0.32	0.19	0.48	0.43	0.28	0.56	0.24	0.22	0.27
1960–1969	0.21	0.03	0.46	0.55	0.30	0.72	0.24	0.19	0.29
1970–1979	0.15	0.00	0.35	0.55	0.35	0.70	0.30	0.26	0.35
1980–1989	0.74	0.37	0.83	0.00	0.00	0.33	0.26	0.17	0.40

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