Rewley J, Fawzi MCS, McAdam K, Kaaya S, Liu Y, Todd J, Andrew I, Onnela JP. Evaluating spillover of HIV knowledge from study participants to their network members in a stepped-wedge behavioural intervention in Tanzania.
BMJ Open 2020;
10:e033759. [PMID:
33033007 PMCID:
PMC7542922 DOI:
10.1136/bmjopen-2019-033759]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 08/06/2020] [Accepted: 08/10/2020] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVES
We aim to describe the social network members of participants of a behavioural intervention, and examine how the effects of the intervention may spillover among network members.
DESIGN
Secondary analysis of a step-wedge randomised controlled trial.
SETTING
Change agents (CAs) were recruited from waiting rooms of HIV treatment facilities in Dar es Salaam, Tanzania, and their network members (NMs) were recruited directly by CAs.
PARTICIPANTS
We enrolled 662 CAs in an HIV behavioural intervention. They, along with 710 of their NMs, completed baseline and follow-up interviews from 2011 to 2013.
PRIMARY AND SECONDARY OUTCOMES
The primary outcome of this study was change in NMs' HIV knowledge, and the secondary outcome was whether the NM was lost to follow-up.
RESULTS
At baseline, many characteristics were different between NMs and CAs. We found a number of NM characteristics significantly associated with follow-up of NMs, particularly female gender (OR=1.64, 95% CI: 1.02 to 2.63) and HIV knowledge (OR=20.0, 95% CI: 3.70 to 125); only one CA variable was significantly associated with NM follow-up: having a private source of water (OR=2.17, 95% CI: 1.33 to 3.57). The 14.2% increase in NMs' HIV knowledge was largely due to CAs feeling empowered to pass on prior knowledge, rather than transmitting new knowledge to their NMs.
CONCLUSIONS
Characteristics of social network members of persons living with HIV persons living with HIV may play a role in study retention. Additionally, the HIV knowledge of these NMs increased largely as a function of CA participation in the intervention, suggesting that intervening among highly-connected individuals may maximise benefits to the potential population for whom spillover can occur.
TRIAL REGISTRATION NUMBER
Clinical Trial: NCT01693458; Post-results.
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