“…The control variables were age in years (18–25, 26–34, 35–49, 50–64, 65 or older); sex (male or female); marital status (married, divorced/separated, widowed, or never married); ethnoracial identity (non-Hispanic White, non-Hispanic African American, non-Hispanic Native American/Alaska Native, non-Hispanic Native Hawaiian/Pacific Islander, non-Hispanic Asian, non-Hispanic more than one race, or Hispanic); annual household income (less than US$20,000, US$20,000–49,999, US$50,000–74,999, or US$75,000 or more); educational attainment (fifth grade or less, sixth grade, seventh grade, eight grade, ninth grade, tenth grade, eleventh grade, twelfth grade, Freshman/13th year, Sophomore/14th year or Junior/15th, Senior/16th year or Grad/Prof School); self-reported engagement in risky behavior (never, seldom, sometimes, or always); lifetime cocaine use; lifetime marijuana use; lifetime 3,4-methylenedioxymethamphetamine (MDMA/ecstasy) use; lifetime phencyclidine (PCP) use; lifetime inhalants use; lifetime other stimulants use; lifetime sedatives use; lifetime pain relievers use; lifetime smokeless tobacco use; lifetime pipe tobacco use; lifetime cigar use; lifetime daily cigarette use; and age of first alcohol use (less than 13 years of age [Preteen], 13–19 years of age [Teen], more than 19 years of age [Adult], or never used). The control variables were coded as separate covariates and were the same as those used in a recent study analyzing the same NSDUH survey years 22 .…”