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Table 1 Agreement between self-reported drug use and biochemical testing via urine toxicology screen for 190 patients admitted with traumatic injury

From: Validity between self-report and biochemical testing of cannabis and drugs among patients with traumatic injury: brief report

 

Any drug

Cannabis

Response

Tox +

Tox –

Tox +

Tox –

Self-report—yes

21

24

12

28

Self-report—no

14

131

8

142

Sensitivity (95% CI)

0.60 (0.42, 0.76)

0.60 (0.36, 0.81)

Specificity (95% CI)

0.85 (0.78, 0.90)

0.84 (0.77, 0.89)

PPV (95% CI)

0.47 (0.32, 0.62)

0.30 (0.17, 0.47)

NPV (95% CI)

0.90 (0.84, 0.95)

0.95 (0.90, 0.98)

  1. Tox urine toxicology screen, PPV positive predictive value, NPV negative predictive value
  2. Results are tabulated for the subset of patients with toxicology screening. Patients were defined as being tox screen positive (Tox +) or negative (Tox−) based on detection on the multi-drug panel (amphetamines, barbiturates, benzodiazepines cocaine, opiates, MDMA, and tetrahydrocannabinol (THC; cannabis)
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Journal of Cannabis Research

ISSN: 2522-5782