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Table 2 Prevalence of drug use by point-of-care urine drug screen (UDS) and Computer-Assisted Self Interview (CASI) among 225 HIV-infected patients in middle Tennessee, USA (%)

From: Current drug use and lack of HIV virologic suppression: point-of-care urine drug screen versus self-report

Drug UDS proportion (95% CI)* CASI
Past 7 days Past 6 months Lifetime
Any drugs 53.5 (47.0-60.0) 42.0 59.3 92.4
Marijuana 36.0 (29.7-42.3) 28.6 44.1 85.0
Cocaine 25.8 (20.1-31.5) 18.9 29.5 66.8
Opiates 7.6 (4.1-10.1) 7.5 18.5 43.8
Meth/amphetamine 2.2 (0.3-4.1) 1.8 6.2 25.2
Injection N/A 0.4 1.8 23.7
  1. Note: CI: confidence interval; N/A: not applicable.
  2. *95% CI was calculated in order to assess whether or not the CASI point estimate was likely to be within 95% CI of the UDS estimate.
  3. The prevalence of 7-day drug use by CASI is less than the lower bound of 95% CI of the prevalence by UDS.