The influence of interviewers on survey responses among female sex workers in Zambia.
BMC Med Res Methodol
; 19(1): 60, 2019 03 15.
Article
em En
| MEDLINE
| ID: mdl-30876402
ABSTRACT
BACKGROUND:
Interviewers can substantially affect self-reported data. This may be due to random variation in interviewers' ability to put respondents at ease or in how they frame questions. It may also be due to systematic differences such as social distance between interviewer and respondent (e.g., by age, gender, ethnicity) or different perceptions of what interviewers consider socially desirable responses. Exploration of such variation is limited, especially in stigmatized populations.METHODS:
We analyzed data from a randomized controlled trial of HIV self-testing amongst 965 female sex workers (FSWs) in Zambian towns. In the trial, 16 interviewers were randomly assigned to respondents. We used hierarchical regression models to examine how interviewers may both affect responses on more and less sensitive topics, and confound associations between key risk factors and HIV self-test use.RESULTS:
Model variance (ICC) at the interviewer level was over 15% for most topics. ICC was lower for socio-demographic and cognitively simple questions, and highest for sexual behaviour, substance use, violence and psychosocial wellbeing questions. Respondents reported significantly lower socioeconomic status and more sex-work related violence to female interviewers. Not accounting for interviewer identity in regressions predicting HIV self-test behaviour led to coefficients moving from non-significant to significant.CONCLUSIONS:
We found substantial interviewer-level effects for prevalence and associational outcomes among Zambian FSWs, particularly for sensitive questions. Our findings highlight the importance of careful training and response monitoring to minimize inter-interviewer variation, of considering social distance when selecting interviewers and of evaluating whether interviewers are driving key findings in self-reported data. TRIAL REGISTRATION clinicaltrials.gov NCT02827240 . Registered 11 July 2016.Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Infecções por HIV
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Programas de Rastreamento
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HIV-1
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Profissionais do Sexo
Tipo de estudo:
Clinical_trials
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Prognostic_studies
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Qualitative_research
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Risk_factors_studies
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Screening_studies
Limite:
Adult
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Female
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Humans
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Male
País/Região como assunto:
Africa
Idioma:
En
Revista:
BMC Med Res Methodol
Assunto da revista:
MEDICINA
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Reino Unido