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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Psychol Med. 2011 Jan 20;41(9):1907–1916. doi: 10.1017/S003329171000259X

Fig. 1.

Fig. 1

Genetic components of the full model fitted to self-report measures of smoking (S), alcohol intoxication (E), and illicit drug consumption (D) at ages 13–14, 16–17 and 19–20 years. A1, A2 and A3, additive genetic effects for ages 13–14, 16–17 and 19–20 respectively; As1, Ae1 and Ad1, specific additive genetic effects for smoking, alcohol intoxication and illicit drug use respectively at age 13–14; As2, Ae2 and Ad2, specific additive genetic effects for smoking, alcohol intoxication and illicit drug use respectively at age 16–17; As3, Ae3 and Ad3, specific additive genetic effects for smoking, alcohol intoxication and illicit drug use respectively at age 19–20.