<p>All variables are statistically significant (p<0.05 or less) from one another, based on Pearson χ<sup>2</sup> tests of categorical variables (df = 3, χ<sup>2</sup> values larger than critical value 7.81) and ANOVA (F(3, 26,311) = 3,057, (p<0.001)) with Tukey-Kramer post-hoc tests for multiple pairwise comparisons for the age variable.</p><p>SD = standard deviation.</p>*<p>For duration of use, illicit drugs include cocaine, amphetamines, hallucinogens, and inhalants; heroin is presented separately. Therapeutics include benzodiazepines, antidepressants, and methadone and exclude all other prescription opioids.</p
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