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Table 1 Measures, outcomes, and data sources

From: Evaluating networked drug checking services in Toronto, Ontario: study protocol and rationale

Measures and outcomesData sources
Aim 1: Evaluate the impact of DCS access on changes in and factors influencing overdose and related risk behaviors
 Self-reported overdose among those that access DCS and those that do not– Quantitative survey data (intake)
– SCS client data
 Proportion of participants reporting increase in protective behaviors (not using alone, carrying naloxone, use of SCS, consultation with staff, smaller/) “tester” dosage, discarding toxic substances)– Quantitative survey data (intake/post-test)
– SCS client data
 Proportion of participants reporting they gained, intend to use, and/or used knowledge and skills– Quantitative survey data (post-test)
– Qualitative interviews
Aim 2: Investigate the perceived capacity of DCS to prevent overdose
 Characterize participant perceptions on the capacity of DCS to alter the risk of overdose– Qualitative interviews
 Identify participant perceptions of contexts, facilitators, and barriers to the use of DCS– Qualitative interviews
Aim 3: Identify trends in the composition (qualitative and quantitative) of the unregulated drug supply in Toronto
 Number of analysis results detecting composition different from participant expectations– Quantitative survey data (intake)
– Drug sample analysis data
 Increase in accuracy and timeliness of alerts in response to dangerous drug trends– Drug sample analysis data
– Qualitative interviews
 Spatial association between frontline harm reduction agencies with DCS and fatal overdose, and changes over time– First responder and coroner data (from OCC and TPaS)