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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Psychol Med. 2013 Apr 23;44(2):10.1017/S0033291713000846. doi: 10.1017/S0033291713000846

Fig. 1.

Fig. 1

The cumulative probability of receiving a drug abuse (DA) diagnosis over a 26-year follow-up period for siblings, where the older versus younger sibling had DA as predicted from the full Cox model, the results of which are given in Table 2.