Table 5.

Twin correlations for personality factors; and cross trait cross-twin correlations with GCSE results and personality factors (95% confidence intervals in the parentheses).

	MZ correlation	DZ correlation	MZ cross-trait cross-twin correlations	DZ cross-trait cross-twin correlations
Perseverance of Effort	0.35 (N=776) (0.30, 0.42)	0.17 (N=1211) (0.12, 0.23)	0.18 (N=757) (0.11, 0.24)	−0.008 (N=1210) (−0.06, 0.05)
Consistency of Interests	0.24 (N=781) (0.18, 0.31)	0.15 (N=1219) (0.09, 0.20)	0.04 (N=760) (−0.03, 0.11)	−0.006 (N=1216) (−0.06, 0.05)
Conscientiousness	0.34 (N=755) (0.28, 0.40)	0.07 (N=1167) (0.008, 0.12)	0.19 (N=747) (0.12, 0.25)	0.03 (N=1194) (−0.03, 0.08)
Neuroticism	0.29 (N=759) (0.23, 0.36)	0.15 (N=1183) (0.10, 0.22)	0.003 (N=751) (−0.08, 0.06)	0.03 (N=1200) (−0.02, 0.09)
Extraversion	0.39 (N=751) (0.32, 0.44)	0.14 (N=1173) (0.08, 0.19)	0.11 (N=743) (0.03, 0.18)	0.03 (N=1198) (−0.02, 0.09)
Openness	0.35 (N=757) (0.29, 0.41)	0.08 (N=1176) (0.03, 0.14)	0.08 (N=748) (0.01, 0.15)	0.02 (N=1199) (−0.03, 0.08)
Agreeableness	0.24 (N=750) (0.18, 0.31)	0.11 (N=1167) (0.05, 0.16)	0.03 (N=744) (−0.04, 0.10)	−0.02 (N=1190) (−0.07, 0.04)