Measures
Depression, HIV and HIV treatment knowledge [Depression, Viral suppression
DISORDERS
Table 
Factors explored as (A) effect modifiers and (B) mediators of the intervention effect, across timepoints of assessmentAbbreviations: EPDS: Edinburgh Postnatal Depression Scale; K-10: Kessler-10 scale; AUDIT-C: Alcohol Use Disorders Identification Test – Consumption.At various antenatal and postpartum timepoints, a battery of psychosocial measures was administered. Measures were selected drawing on SAT, described above, and on factors known to be associated with adherence behaviours. We adapted previously used tools to assess HIV and HIV treatment knowledge [Depression during the past week was assessed using the Edinburgh Postnatal Depression Scale (EPDS), which has been validated for use during pregnancy [At study visits, women provided 5ml of venous blood for HIV viral load (VL) testing, conducted by the National Health Laboratory Service (NHLS) using the Abbott Molecular RealTime HIV-1 assay (Abbott Molecular, Illinois, USA). Data on health service usage was requested from the Western Cape Provincial Health Data Centre, including data pertaining to HIV care visits; pharmacy dispensing; and laboratory results. The primary outcome for the MCH-ART trial was a binary composite endpoint of retention in care and viral suppression at 12 months postpartum. Retention in care was defined as any evidence of HIV-related clinical care received between 9 and 18 months postpartum, based on routinely collected records of HIV clinical care visits, ART dispensing, and HIV-related laboratory testing. Viral suppression was defined as VL < 50 copies/ml at the 12 month postpartum study visit. Women were considered as having achieved the primary endpoint if they had both evidence of retention in care and VL < 50 copies/mL [