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Figure 4 (a): Age of initiation and positive family history of substance dependence. Initiation of substance abuse in 10-19 years with positive family history chi-square value = 164.7, P<0.0001, Signifi cant statistically. People with positive family history of substance dependence take substances earlier Figure 4 (b): Age of initiation and negative family history of substance dependence

Figure 4 (a): Age of initiation and positive family history of substance dependence. Initiation of substance abuse in 10-19 years with positive family history chi-square value = 164.7, P<0.0001, Signifi cant statistically. People with positive family history of substance dependence take substances earlier 
Figure 4 (b): Age of initiation and negative family history of substance dependence