Power calculation

Forty existing MF group clusters with 900 PLHIV will be randomised in a 1:1 ratio to either MF +ICB or MF +SOC. For the power calculations, the SD of the group size was set to 5, type-1 error rate to 0.05, and the intraclass correlation coefficient to 0.05. Based on studies of the effect of financial interventions we expect at least 15% increase in VS between MF+ICB and MF+SOC, MF+SOC and SOC only, and MF+ICB and SOC only groups.^{18 71} The power calculations used VS in MF+SOC ranging from 20% to 50% and accounted for 15% drop-out.²⁸ For all the different scenarios considered, the power to detect a 15% increase in VS was greater than 80% for testing all three hypotheses.