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Multivariate multilevel mixed-effects logistic regression adjusted odds ratios with a 95% confidence interval: (A) relation between students’ socioeconomic status, parental education and the patterns of cocaine use (Experimenter, Episodic and Frequent); (B) relation between students’ socioeconomic status, parental education, truancy at school, reading books for enjoyment and the patterns of cocaine use (Experimenter, Episodic and Frequent). Authors’ elaboration on ESPAD data.
