Statistical analysis
The statistical power was estimated for the primary outcome (partner uptake of HIV testing within 4 weeks after ART client enrolled in the study). With a type I error of 0.05 and sample sizes of 110 in standard of care and 250 in HIVST arms (randomized 1:2·5), we had >90% power to detect a difference in partner testing coverage of 40% in standard of care and 60% in HIVST. We inflated the sample size to account for potential loss to follow-up, assuming that 20% of individuals will be lost to follow-up (LTFU) in either arm and 15% have missing data. We use conservative outcome estimates based on preliminary data.We used the CONSORT standards for reporting trial outcomes. All analyses were prespecified based on the protocol. Descriptive statistics (mean, standard deviation, median, inter-quartile range, and frequency distribution) were generated for all demographic and clinical information to characterize the study population overall and by study arm. We used a modified intention-to-treat analysis whereby ART clients who were LTFU (i.e., could not be contacted to complete an endline survey) were excluded from the analysis since it was impossible to determine outcomes. Clients who participated in the endline survey but had missing data for the primary outcome (10%; 35/364), or were unsure of primary outcome (2%; 9/364), were counted as failures (i.e., no HIV test completed by partner). We conducted sensitivity analyses using true intention-to-treat principles whereby those LTFU for endline surveys were counted as failures—analyses showed similar findings as the modified intention to treat approach (see 