. Author manuscript; available in PMC: 2014 Oct 1.

Published in final edited form as: Twin Res Hum Genet. 2013 Aug 8;16(5):970–976. doi: 10.1017/thg.2013.51

Table 1.

Means and standard deviations on smoking composite and absolute difference in smoking composite between twins for the four samples.

		Composite Smoke Score		Absolute Difference in Smoke Score

	N	Mean	SD	Mean	SD
MZ Males	216	1.62	.78	.40	.65
MZ Females	293	1.53	.80	.25	.55
DZ Males	135	1.77	.82	.53	.73
DZ Females	195	1.62	.79	.47	.78