Investigating interventions to increase uptake of HIV testing and linkage into care or prevention for male partners of pregnant women in antenatal clinics in Blantyre, Malawi: study protocol for a cluster randomised trial

Table 1 Simulation inputs

Description	Input
Number of ANC days (clusters) per arm for both stages	6–20
Number of participants per ANC day	20
Linkage to care or prevention for the SOC arm in stages 1 and 2	25%
Linkage to care or prevention for the 5 intervention arms in stages 1 and 2	29–40%
SD of the mean of cluster-level proportions per arm (7 clusters, stage 1)^a	0.05–0.08

ANC antenatal care, SOC standard of care, SD standard deviation
^aComputed using σ = k × μ where σ is the standard deviation of the true cluster-level proportions; k is the coefficient of variation (assumed to be 0.2) and μ is the mean of the proportions per arm
Operating characteristics: stage 1 α = 0.2; stage 2 α = 0.1; 1 − β = 0.8

ISSN: 1745-6215