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Longitudinal influence of alcohol and marijuana use on academic performance in college students

Fig 2

Linear mixed model plot.

Bar plot of GPA (estimated marginal means) across semesters by cluster. Post-hoc between-group analysis (using a sidak correction for multiple comparisons) is also indicated. Between-cluster, post-hoc significances are marked as follows: ***p<0.001, **p<0.005,*p<0.01. Note: Error bars represent standard error of mean.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0172213.g002