and alcohol abuse ( r (1217 ) ¼ 0.39, p < 0.01) ( Table 2 ) .
Dependence on illegal substances other than cannabis was also strongly
correlated with alcohol dependence ( r ( 1217 ) ¼ 0.5 8, p < 0.01).
In addition, some individuals ( 21 % ) had been diagnosed with major depressive disorder (according to DSM - IV ) ( DEP ) , but DEP was negatively correlated with cannabis use ( r (1217 ) ¼ 0.09 ,
p o 0 . 01 ), substance dependence ( r ( 1217 ) ¼ 0.15, p o 0.01), and substance abuse ( r ( 1217 ) ¼ 0.21, p < 0.01).