2.6. Data source
Outcome data came from facility-level data that were reported routinely to Aurum Institute from the facility through TIER.Net, South Africa’s national HIV surveillance system. Headcount data were not available for one intervention facility from March-August 2021; missing values were imputed with the facility’s monthly average headcount from the previous six months. Three facilities (two control, one intervention) were missing headcount data for November-December 2019; these values were imputed with each facility’s monthly average headcount from the remaining pre-COVID period (October 2019-March 2020).