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Fig 1.

Hierarchical decision tree that classifies polydrug use.

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Fig 2.

Seven distinct polydrug use patterns.

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Table 1.

Demographics and prevalence of drug use among the respondents, 2020 NSDUH.

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Table 1 Expand

Table 2.

Prevalence of single drug and polydrug use among the respondents who used at least one of five drug groups, 2020 NSDUH.

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Table 2 Expand

Table 3.

Polydrug use patterns among respondents who engaged in polydrug use during past-month or past-year, 2020 NSDUH.

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Table 3 Expand

Table 4.

Associations between respondents’ first drug used and polydrug use and polydrug use with opioid involvement, 2020 NSDUH.

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Table 4 Expand