Table 2.

Measures According to Theoretical Constructs and Times of Collection.

Constructs	Measures	Timea
Health outcomes
Medication adherence	BETRCap data	Daily
	Self-report measure for medication adherence—collected by weekly app assessment (3 items, α = 0.83)	Weekly
Clinical outcomes	Viral load—collected by nurse	BL, 6 mo
	TFV-DP levels (DBS)—collected by nurse	IPI
	ART levels hair sample—self-collected	BL, IPI
	Urine Tenofovir POC test—self-collected	BL, IPI, 3 mo, 6 mo
Medical appointment attendance	Clinic attendance records—extracted from medical records	BL, 6 mo
Couple interactions
Social support	Medication specific social support (8 items, α = 0.92); Social support and relationship satisfaction—weekly app assessment	BL, IPI, 3 mo, 6 mo
Relationship satisfaction	Global distress scale—marital satisfaction inventory revised (22 items, α = 0.95)	BL, IPI, 3 mo, 6 mo
Self-regulation
Knowledge of ART	HIV treatment knowledge inventory (12 items, α = 0.70)	BL, IPI, 3 mo, 6 mo
Knowledge of treatment	Knowledge of personal treatment regimen	BL, IPI, 3 mo, 6 mo
Adherence attitudes	Attitudes about HIV Medications (11 items, α = 0.70)	BL, IPI, 3 mo, 6 mo
Substance use	Alcohol use disorders identification test (AUDIT) (10 items, α = 0.85); drug abuse screening test (DAST) (10 items, α = 0.94); drug treatment history	BL, IPI, 3 mo, 6 mo
Self-efficacy	Adherence self-efficacy (13 items, α = 0.96)	BL, IPI, 3 mo, 6 mo
Risk behaviors	Sexual risk and substance use risk behaviors	BL, IPI, 3 mo, 6 mo
Contextual influences
Background	Demographics	BL
Environmental stress	Economic and food insecurity, stressful life events	BL, IPI, 3 mo, 6 mo
Stigma	Social impact scale for HIV (24 items, α = 0.85); drug use stigma (9 items, α = 0.80)	BL, IPI, 3 mo, 6 mo

^aBL = baseline, IPI = immediately post-intervention (1 month), 3 mo = 3-month follow-up, 6 mo = 6-month follow-up.