. Author manuscript; available in PMC: 2010 Jul 7.

Published in final edited form as: Behav Genet. 2008 Mar 27;38(4):339–347. doi: 10.1007/s10519-008-9202-7

Table 1.

Correlations among target, target's best friend, sibling, and sibling's best friend by sibling pair type

Relationship	Correlations by pair type

	MZ	DZ	FS	HS	CO	NR
Target–Sibling	0.600	0.510	0.285	0.279	0.052	0.449
Target's BF–Sibling's BF	0.437	0.316	0.211	0.142	0.082	0.321
Target–Sibling's BF/Sibling–Target's BF	0.346/0.318	0.414/0.376	0.136/0.175	0.128/0.016	−0.213/0.368	0.370/0.509
Target–Target's BF/Sibling–Sibling's BF	0.461/0.382	0.457/0.317	0.304/0.382	0.644/0.244	−0.074/0.052	0.560/0.386