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At month 12, the number of positives was 57 (9.7%) in the high-value conditional cash transfer arm, while it was 79 (12.8%) in the low-value conditional cash transfer arm and 126 (12.1%) in the control group.
Unadjusted RR for the high-value conditional cash transfer arm compared to the low-value conditional cash transfer arm was 0.76 (95% CI 0.49 to 1.03) and the adjusted RR was 0.69 (95% CI 0.45 to 0.92).
In the low-value conditional cash transfer arm, those numbers are 194 (37.4%) for 'very much' and 107 (20.6%) for 'somewhat'somewhat
The intervention arm was divided into two subarms a low-value conditional cash transfer arm eligible for up to $30 over the course of the study (10 000 Tanzanian shillings or approximately $10 per testing round) and a high-value conditional cash transfer arm eligible for up to $602020 000 Tanzanian shillings or approximately $20 per testing round).
The comparison between the impacts of the conditional cash transfer intervention in the high-value conditional cash transfer arm to that in the low-value conditional cash transfer arm permits us to better understand at which threshold conditional cash transfers can be effective as an HIV and STI prevention tool.
Tests for statistical differences with the control arm yielded p values of 0.673 for the high-value conditional cash transfer arm and 0.742 for the low-value conditional cash transfer arm, so differences across the three study arms in the percentage of spouses joining the study are minimal and not statistically significant.
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Furthermore, study participants randomised into the conditional cash transfer arms declared that the financial incentives motivated them to modify their behaviour.
14 17 Individuals in the conditional cash transfer arms were not eligible for the cash award at the 4-, 8- and 12-month testing rounds if they tested positive for any of the following: C trachomatis, N gonorrhoeae and T vaginalis.
At months 4 and 8 (columns 1 and 2), the combined prevalence of the four STIs tested by nucleic acid amplification tests is shown to have RRs lower than 1 for the two conditional cash transfer arms compared to the control arm, but not significantly so.
In the intervention arms, conditional cash transfer payments were tied to negative sexually transmitted infection test results.
Participants were randomly assigned to either a control arm (n=1124) or one of two intervention arms: low-value conditional cash transfer (eligible for $10 per testing round, n=660) and high-value conditional cash transfer (eligible for $20 per testing round, n=615).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com