At some point in their lives, 4782 participants of the NESARC sample met DSM-IV alcohol dependence criteria. Of these, age at onset was available for 4697 (99.6%). Admixture analysis decompounded the observed distribution of age at onset into a mixture of several normal theoretical distributions. The best-fitting model in terms of AIC had two components with a mean (SD) of 19.6 (S.D= 2.7) and 32.9 (S.D= 10.2) years (Table 1).
