. Author manuscript; available in PMC: 2010 Jun 24.

Published in final edited form as: Twin Res Hum Genet. 2009 Oct;12(5):433–440. doi: 10.1375/twin.12.5.433

Table 3.

Sample characteristics by risk group

Risk Group	Parent Age M(SD)	Child Age M(SD)	Child Sex (%Male)
1. Parent AUD+	41.30 (3.99)^a	13.67 (3.64)^a	52
2. MZ co-twin AUD+	41.05 (4.28)^a	13.94 (3.47)^a,b	49
3. DZ co-twin AUD+	41.36 (4.30)^a	13.80 (3.81)^a,b	52
4. Parent and co-twin AUD−	42.59 (3.98)^b	14.40 (3.82)^b	51

Note: Means with different superscripts are significantly different from each other.