Data were entered into an Excel spreadsheet , and analysed using a combination of Excel and Stata 14 . All cost and income data were inflated using the local inflation rate to reflect prices in October 2015 , and then converted to USD using the average conversion rate in October 2015 , R 13.08 = 1 USD ( XE , n.d . ) . Participants were interviewed in a private space and all data were anonymised prior to analysis . The trial , including the costing study , was approved by the Research Ethics Committees of the University of Witwatersrand ( approval number : R14/49 M111177 ) , the London School of Hygiene and Tropical Medicine ( approval number : 6099 ) , and the Provincial Research Committees of Gauteng , North West and Limpopo .