Table 1 Descriptive statistics, and phenotypic and intraclass twin correlations (with 95% confidence intervals) of the four conscientiousness variables.

		M	SD	Phenotypic correlations [with 95% CI]				Intraclass correlations [with 95% CI]
		M	SD	1	2	3	4	MZ	DZ
1	Conscientiousness	3.13	0.41	–	0.78	0.79	0.78	0.61	0.35
1	Conscientiousness	3.13	0.41	–	[0.76, 0.80]	[0.77, 0.80]	[0.76, 0.80]	[0.57, 0.64]	[0.28, 0.42]
2	Effortful control	3.15	0.52	0.79	–	0.77	0.75	0.56	0.31
2	Effortful control	3.15	0.52	[0.77, 0.80]	–	[0.75, 0.79]	[0.73, 0.77]	[0.52, 0.60]	[0.24, 0.38]
3	Self-control	3.13	0.47	0.79	0.77	–	0.74	0.58	0.32
3	Self-control	3.13	0.47	[0.78, 0.81]	[0.75, 0.79]	–	[0.72, 0.76]	[0.55, 0.62]	[0.25, 0.39]
4	Grit	3.14	0.42	0.79	0.75	0.74	–	0.58	0.35
4	Grit	3.14	0.42	[0.76, 0.80]	[0.73, 0.77]	[0.72, 0.76]	–	[0.54, 0.61]	[0.28, 0.42]

In the phenotypic correlation matrix, numbers below the diagonal are simple correlations, and those above the diagonal partial correlations after controlling for age and sex.

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