Table 1.

Sample compositions for the variance components, reliability, and genome-wide association (GWA) discovery and replication analyses.

	Variance components	Test-retest reliability	GWA discovery	GWA replication
Monozygotic pairs	110	10	81	7
Monozygotic pairs plus one singleton sibling	0	0	6	0
Dizygotic pairs	138	12	93	20
Dizygotic (trizygotic) triplets	0	0	1	0
Dizygotic pairs plus one singleton sibling	0	0	7	0
Dizygotic pairs plus two singleton siblings	0	0	1	0
Unpaired twins	264	10	187	28
Single non-twin siblings	0	4	37	3
Two non-twin siblings	0	0	29	6
Three non-twin siblings	0	0	1	0
Total n	760	58	679	97
(males/females)	(287/473)	(26/32)	(247/432)	(40/57)