1. Objectifs

Intentions :
«Our aims are: (1) to identify specific psychosocial risk factors in grades 7 and 8 of simultaneous alcohol and cannabis use in grade 10; and (2) to determine how simultaneous alcohol and cannabis use in grade 10 relates to substance-related problems in grade 11.» (p. 786)

2. Méthode

Échantillon/Matériau :
«Participants were high school students from disadvantaged areas of Quebec (Canada) followed from grades 7 to 11 […] The sample included 6589 participants […].» (p. 786)

Instruments :
Questionnaire

Type de traitement des données :
Analyse statistique

3. Résumé

According to the authors, «[s]imultaneous use was found to be associated with a wide range of individual (male gender, depressive symptoms, low school grades, alcohol intoxication, cannabis use, and delinquency), family (poor communication with parents, lack of parental rules, conflict with parents, having separated parents), and peer-related (drug use by closest friends) predictors at high school entry in grades 7 and 8. In multivariate models, most of these associations were better accounted for by three variables reflecting early-onset individual and peer substance use: cannabis use, alcohol intoxication, and drug use by closest friends. Conflict with parents was the only predictor to remain predictive over these variables, but its association with the outcome disappeared after accounting for the frequency of alcohol and cannabis use in grade 10. Overall, this suggests that early individual and contextual predictors outside of substance-related behaviors are likely to relate to simultaneous usage via a contribution to more general aspects of substance use such as initiation and frequency of use. […] This provides, to our knowledge, the first compelling evidence that simultaneous usage might constitute a hazardous behavior with potentially harmful consequences for adolescents in the general population.» (p. 787)