TABLE 3.

Descriptive statistics and twin correlation coefficients for MB-COMT DNAm and all phenotypic measures.

Measures		Twin 1	Twin 2	Differences	Intrapair correlations
		M (SD)	M (SD)
MB-COMT DNAm (%)	CpG1	7.54 (5.56)	8.05 (7.42)	6.20 (6.60)	0.13
	CpG2	3.97 (3.70)	4.77 (5.20)	4.03 (5.39)	0.06
	CpG3	5.89 (4.31)	6.44 (6.26)	4.94 (5.75)	0.12
	CpG4	6.08 (4.63)	5.88 (5.56)	4.69 (5.77)	0.14
	CpG5	3.74 (3.25)	4.90 (5.05)	3.88 (4.88)	0.19
	Mean of all CpG sites	5.44 (3.98)	5.99 (5.59)	4.30 (5.43)	0.19
Cognition measures	CLR	69.76 (17.79)	74.71 (17.19)	15.19 (14.84)	0.20
	PE	13.28 (10.71)	9.34 (7.43)	7.41 (9.52)	0.15
	NPE	9.82 (7.01)	11.38 (10.35)	7.36 (7.51)	0.22
	FMS	0.79 (1.52)	0.56 (1.12)	0.79 (1.15)	0.12
Personality measures	BIS	15.69 (3.65)	14.77 (3.60)	3.69 (3.11)	0.28
	BAS	16.97 (3.97)	16.33 (3.43)	3.25 (2.61)	0.37*
	Fight	13.91 (4.06)	15.52 (3.81)	3.36 (2.71)	0.58**
	Flight	12.74 (2.59)	12.42 (2.64)	2.32 (2.02)	0.20
	Freeze	10.24 (2.99)	9.77 (2.43)	1.96 (2.03)	0.51**
Laboratory-induced aggression: punishment intensity	Block 1 = no provocation	4.78 (2.98)	4.71 (2.93)	0.70 (0.64)	0.54**
	Block 2 = low provocation	4.64 (3.08)	4.93 (3.25)	0.80 (0.59)	0.48**
	Block 3 = mild provocation	4.85 (3.18)	5.29 (3.34)	0.71 (0.51)	0.60**
	Block 4 = high provocation	5.13 (3.31)	5.64 (3.32)	0.77 (0.52)	0.55**
Laboratory-induced aggression: punishment duration	Block 1 = no provocation	4.28 (3.02)	4.49 (2.52)	0.83 (0.69)	0.41**
	Block 2 = low provocation	4.05 (2.78)	4.58 (2.87)	0.91 (0.66)	0.35*
	Block 3 = mild provocation	4.58 (3.13)	5.13 (3.04)	0.82 (0.61)	0.45**
	Block 4 = high provocation	4.86 (3.18)	5.68 (3.02)	0.75 (0.54)	0.56**

Note. CLR, Conceptual level response; PE, Perseverative errors; NPE, Non-perseverative errors; FMS, Failure to maintain set. **p < 0.01, **p < 0.05.