. Author manuscript; available in PMC: 2009 Jun 8.

Published in final edited form as: Behav Genet. 2009 Mar 13;39(3):265–276. doi: 10.1007/s10519-009-9261-4

Table 2.

Cross-Sibling Within-Trait Polychoric Correlations by Sibling Type and Gender

	MT	PMT	Neglect	SMT
All	MZ .34 (.21–.46)	.46 (.27–.61)	.36 (.21–.50)	.13 (−.38–.58)
	DZ .31 (.20–.42)	.32 (.15–.48)	.25 (.25–.10)	.34 (−.03–.64)
	FS .19 (.12–.27)	.30 (.21–.40)	.18 (.09–.27)	.24 (−.05–.50)
Male	MZ .22 (−.01–.42)	.33 (−.01–.59)	.31 (.08–.52)
	DZ .27 (.06–.46)	.03 (−.28–.35)	.28 (.02–.50)
	FS .17 (.03–.32)	.33 (.14–.50)	.18 (.00–.36)
Female	MZ .41 (.25–.55)	.55 (.32–.72)	.41 (.19–.58)
	DZ .36 (.11–.55)	.56 (.27–.75)	.20 (−.10–.46)
	FS .21 (.07–.34)	.30 (.12–.46)	.24 (.07–.40)
Opposite Sex	DZ .32 (.14–.47)	.35 (.08–.57)	.25 (.01–.46)
Opposite Sex	FS .20 (.09–.30)	.29 (.14–.43)	.14 (.00–.27)

Note. SMT correlations were not computed by gender due to small cell sizes. MT = composite maltreatment; PMT = physical maltreatment; SMT = sexual maltreatment. MZ = monozygotic; DZ = dizygotic; FS = nontwin full sibling.