Table 1.

List of study measures and data collection schedule.

Study measures		Instrument	Data collection schedule (months)
			0	2	6	12	18	24
			Primary outcomes
	Major depression	The Mini International Neuropsychiatric Interview [32]	✓		✓	✓	✓	✓
	Functioning level	5-item locally developed function assessment method [39]	✓		✓	✓	✓	✓
Secondary outcomes
	Depression symptoms	Self-Reporting Questionnaire [34]	✓		✓	✓	✓	✓
	Posttraumatic stress symptoms	Locally adapted Harvard Trauma Questionnaire [40]	✓		✓	✓	✓	✓
	Alcohol use	10-item Alcohol Use Disorders Identification Test [44]	✓		✓	✓	✓	✓
	Disability days	Single question “How many working days have you lost due to depression-related symptoms in the previous 30 days?	✓		✓	✓	✓	✓
	Cost-effectiveness	Estimation of incremental costs of the GSP intervention arm as compared to the control arm	✓		✓			✓
	Poverty index scores	Questions on indicators of socioeconomic status such as the building materials of the household dwelling unit, access to electricity, type of cooking fuel, source of lighting, household remoteness (distance to nearest health facility), household food security, household durable assets such as radios, televisions, and mobile phones	✓		✓			✓
	Adherence to ART	One question: “During the past week, on how many days have you missed taking all your medication doses?”	✓		✓	✓	✓	✓
	Viral load	Medical charts of study participants	✓		✓		✓
Potential effect modifiers
	Sociodemographic variables	Standardized Demographic Questionnaire	✓
	Trauma events	Locally developed 16-item trauma event checklist	✓
Potential effect mediators
	Self-esteem	Rosenberg Self-Esteem Scale [41]	✓		✓	✓	✓	✓
	Social support	12-item Multi-Dimensional Perceived Social Support scale [42]	✓		✓	✓	✓	✓
	HIV-related stigma	HIV-related stigma scale [43]	✓		✓	✓	✓	✓
	Coping skills	COPE Inventory [45]	✓		✓	✓	✓	✓
	The therapeutic relationship	The Scale to Assess the Therapeutic Relationships–Patient version [46]		✓
Process evaluation outcomes
	Indicators of feasibility	The proportion of eligible participants who take up either intervention (Reach), the proportion who attended all 8 sessions of either intervention (dose delivered), and the proportion who are lost to follow-up (attrition) will be determined from the attendance registers		✓
	Indicators of acceptability	A 9-item questionnaire [47] will assess participant’s satisfaction, the group facilitators’ knowledge and attitudes, and the participant evaluation of the intervention’s ability to reduce depression.			✓
	Fidelity	A semistructured self-administered questionnaire completed by group facilitators will assess whether or not the interventions were delivered as planned.		✓
	Contextual influences	A semistructured self-administered questionnaire completed by group facilitators will assess any facilitators or barriers to intervention delivery that they observed during group sessions.			✓
	Causal mechanisms	A semistructured interviewer-administered questionnaire will assess participant’s knowledge, skills, or assets acquired during and after the interventions, which will give an indication as to whether or not the interventions influenced targeted risk factors for depression.			✓