. Author manuscript; available in PMC: 2014 Nov 28.

Published in final edited form as: Arch Gen Psychiatry. 2007 Aug;64(8):958–965. doi: 10.1001/archpsyc.64.8.958

Table 1.

Means, Variances, and Intraclass Correlations of Peer-Group Deviance (PGD) and Percentage of Twins Cohabiting Across Different Ages

Age, y	Mean PGD Score	Variance	MZ ICC	DZ ICC	Twins Cohabiting, %
8–11	4.49	18.52	0.66	0.47	99.5
12–14	7.48	38.03	0.68	0.43	98.4
15–17	11.39	45.78	0.67	0.40	92.7
18–21	14.04	49.02	0.66	0.39	33.3
22–25	13.35	48.68	0.65	0.39	12.1

Abbreviations: DZ, dizygotic; ICC, intraclass correlation; MZ, monozygotic.