Common factors

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The co-occurrence of two conditions may also come about due to the presence of shared biological, psychological, social, or environmental risk factors. That is, the factors that increase the risk of one condition may also increase the risk for another [38, 44-47]. For example, both AOD and mental health conditions have been associated with lower socioeconomic status, cognitive impairment, the presence of conduct disorder in childhood and antisocial personality disorder (ASPD). It is also possible that a genetic vulnerability to one disorder may increase the risk of developing another disorder [47-49].

Figure 2: Explaining comorbidity

Figure 2: Explaining comorbidity

Direct casual hypothesis

AOD use
 
 
Mental health condition
Mental health condition
 
 
AOD use

Indirect casual hypothesis

AOD use
Intermediary factors
 
 
Mental health condition
Mental health condition
Intermediary factors
 
 
AOD use

Common factors hypothesis

AOD use
Common factors hypothesis
 
 
Mental health condition