Table 1 Instruments, instrument-related procedures, and primary outcome measures
Instruments (time; compensation) | Collection time-points and procedures | Primary outcome measures | ||
|---|---|---|---|---|
Enrollment (pre-baseline) | Baseline (t = 0 weeks) | Follow-up (t = 4 weeks) | ||
Substance Use Screener (1–5 min; $0) | Xa,b |  |  |  |
Project Introduction Script (1–2 min; $0) | Xa,b |  |  |  |
Informed Consent (5–10 min; $0) | Xa,b |  |  |  |
Assurance of Consent (1–2 min; $0) | Xa,b |  |  |  |
Locator Form (5–10 min; $0) |  | Xb |  |  |
Baseline Assessment (20–40 min; $20) |  | Xb |  | Baseline measurement of each primary outcome was completed as part of the baseline assessment, which was adapted from the Addiction Severity Index, 5th Edition. [37] Descriptions of the primary outcome measures are provided below |
Follow-up Assessment (20–40 min; $20) |  |  | Xc | Days of primary substance use A continuous measure (ranges from 0 to28) of the number of days participants used their primary substance during the past 28 days Number of substance-related problems A continuous measure (ranges from 0 to 11) of the number of substance use disorder symptoms participants had during the past 28 days Times engaging in risky behaviors A continuous measure (no specified range) of the number of times participants engaged in unprotected sex, injection drug use, or needle sharing during the past 28 days Days of substance use treatment A continuous measure (ranges from 0 to 28) of the number of days participants attended residential treatment, outpatient treatment, or self-help group meetings during the past 28 days Antiretroviral therapy (ART) medication adherence A continuous measure (ranges from 0 to 28) of the number of days participants missed at least one dose of their HIV medications during the past 28 days |