Table 4 Study outcomes

Fidelity to SNaP protocol

Delivering SNaP as intended

% system navigation sessions completed × average quality score + % counseling sessions completed × average quality score

Penetration

% of PWID participants contacted, and enrolled in SNaP

Proportion of newly diagnosed or previously diagnosed and not currently on ART participants at HIV testing sites who are contacted by a navigator and/or counselor and participate in a SNaP session.

Acceptability

Perception that SNaP is agreeable, palatable, or satisfactory.

For PWID participants: acceptability of Intervention Measure scale [61]

For site staff: Ottawa Acceptability of Decision Rules Instrument [62]

Implementation costs

Costs of SNaP and its implementation

Directly measured non-research costs, including all costs of implementation

Uptake of ART

% participants who initiated ART

ART clinic records of consenting participants

Viral suppression

% participants virally suppressed

Undetectable viral load on dried blood spots in the subsample cohort

Uptake of MOUD

% of participants on MOUD

MOUD clinic records of consenting participants