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Table 1 Outcome measures

From: The Cedar Project WelTel mHealth intervention for HIV prevention in young Indigenous people who use illicit drugs: study protocol for a randomized controlled trial

Outcome measure Specific variable Analysis metric Hypothesis (intervention > control) Type Analysis
HIV propensity (6 months) HIV propensity score Mean change - HIV propensity score Decrease in HIV risk Continuous T test
HIV propensity (12 months) HIV propensity score Mean change - HIV propensity score Decrease in HIV risk Continuous T test
HIV vulnerability Injection drug use Mean change - proportion injection Decrease in injection Binary χ2 test
  High-frequency injection Mean change - proportion frequent injection Decrease in injection frequency Binary χ2 test
  Needle sharing Mean change - proportion needle sharing Decrease in needle sharing Binary χ2 test
  Participation in sex work Mean change - proportion sex work Decrease in sex work Binary χ2 test
Resilience Connor-Davidson Resilience Scale (CD-RISC) Mean change - CD-RISC score Increase in resilience Continuous T test
Psychological distress Symptom Checklist-90-R (SCL-90-R) Mean change - SCL-90-R score Decrease in psychological distress Continuous T test
Access to drug-related services Opioid substitution therapy (OST) Mean change - proportion accessed OST Increase in access OST Binary χ2 test
  Needle exchange (NX) Mean change - proportion attended NX Increase in access NX Binary χ2 test
  Safe injection facility (SIF) Mean change - proportion visited SIF Increase in access SIF Binary χ2 test
  Drug treatment Mean change - proportion seeking treatment Increase in seeking treatment Binary χ2 test
  Tried to quit using drugs Mean change - proportion trying to quit Increase in trying to quit Binary χ2 test
Connection to culture Participation in traditional ceremonies Mean change - proportion participated in traditional ceremony Increase in access to ceremony Binary χ2 test
  Frequently living by traditional culture Mean change - proportion lived by traditional culture Increase in traditional culture Binary χ2 test
  1. All variables refer to behaviour in the 6-month period preceding the interview. All variables are measured as mean change in proportion or score from baseline