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. Author manuscript; available in PMC: 2015 Apr 2.
Published in final edited form as: Mol Psychiatry. 2014 Jun 24;19(11):1201–1204. doi: 10.1038/mp.2014.51

Figure 2.

Figure 2

Mean standardized polygenic risk scores for pairs of twins when neither (n=272), one (n=273), or both twins (n=445) had reported use of cannabis. An ordinal regression reported a significant association (p=0.001).