Validity of Self-Reports and Drug Use Among Young People Seeking Treatment for Substance Abuse or Dependence

Abstract

The present study assessed drug use and the validity of self-reports of drug use among young people seeking treatment. On admission the participants (n =316), 215 males and 101 females, were interviewed about their drug use. Urine samples were collected to screen for alcohol, amphetamine, benzodiazepines, cannabis, cocaine, methylenedioxymethamphetamine (MDMA) and opiate use. Self-reports of substance use were compared with urinalysis results. Seventy-three percent of the participants reported use of two or more substances. Single substance users were primarily alcohol users. Kappa agreement between self-report and urinalysis results was of acceptable concordance (≥ 0.65) except for alcohol (κ =0.19). Conditional kappa values were good (≥ 0.85) with exception of opiates (cond. κ =0.57). The self-reports were generally reliable among young people seeking treatment. No significant differences (p ≥ 0.54) were found in the validity of self-reports between the genders.

Key Words:

• Validity
• self-report
• urinalyses agreement
• adolescence
• drug use