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Table 1 Association of drug check results and intentions for dose reduction or drug disposal of Insite clients who used a fentanyl drug checking service in Vancouver, Canada

From: Evaluation of a fentanyl drug checking service for clients of a supervised injection facility, Vancouver, Canada

Drug check resulta Total Dose reduction
Yes; n (%)b
Dose reduction
No; n (%)
Odds ratio
(95% CI)
P valuec
 Positive 391 142 (36.32) 249 (63.68) 9.36 (4.25–20.65) 0.0001
 Negative 122 7 (5.74) 115 (94.26) Ref.  
Drug check resulta Total Drug disposal
Yes; n (%)
Drug disposal
No; n (%)
Odds ratio
(95% CI)
P valuec
 Positive 436 50 (11.47) 386 (88.53) 1.60 (0.79–3.26) 0.186
 Negative 134 10 (7.46) 124 (92.54) Ref.  
  1. aLimited to pre-consumption checks. bAll percentages are row percentage. cP values based on chi-square and Fisher’s exact test as appropriate