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Table 5 Impact of interviewer identity on associations between baseline covariates and HIV testing history in ZEST trial

From: The influence of interviewers on survey responses among female sex workers in Zambia

  Month 1 follow-up, tested in past 30 days Month 4 follow-up, tested in past 30 days
1. No covariates
 Study arm A 1.00   1.00   1.00   1.00   1.00   1.00  
 Study arm B 1.07 [1.02–1.12] 1.07 [0.94–1.21] 1.07 [0.95–1.20] 1.11 [1.03–1.21] 1.13 [0.98–1.31] 1.14 [0.98–1.31]
 Study arm C 0.95 [0.89–1.01] 0.95 [0.84–1.07] 0.94 [0.85–1.05] 1.06 [0.97–1.15] 1.07 [0.95–1.21] 1.08 [0.96–1.22]
 Female vs. male interviewer      0.97 [0.91–1.04]      1.39 [0.70–2.73]
 Interviewer random effects    Yes   Yes     Yes   Yes  
2. Age
 18–24 1.00   1.00   1.00   1.00   1.00   1.00  
 25–29 0.96 [0.92–1.02] 0.96 [0.91–1.03] 0.96 [0.91–1.03] 1.00 [0.93–1.08] 1.01 [0.93–1.10] 1.01 [0.93–1.10]
 30–34 0.94 [0.88–1.01] 0.94 [0.87–1.02] 0.94 [0.87–1.02] 0.99 [0.91–1.08] 0.97 [0.91–1.04] 0.97 [0.91–1.04]
 35+ 0.94 [0.87–1.01] 0.94 [0.85–1.03] 0.94 [0.85–1.03] 0.92 [0.81–1.05] 0.91 [0.80–1.03] 0.91 [0.80–1.03]
 Female vs. male interviewer      0.97 [0.91–1.04]      1.39 [0.70–2.74]
 Interviewer random effects    Yes   Yes     Yes   Yes  
3. Sexual abuse
 Any sexual abuse as adult 1.01 [0.97–1.06] 1.01 [0.97–1.06] 1.01 [0.97–1.06] 0.92 [0.86–0.98] 0.98 [0.90–1.05] 0.97 [0.90–1.05]
 Female vs. male interviewer      0.97 [0.91–1.04]      1.38 [0.70–2.72]
 Interviewer random effects    Yes   Yes     Yes   Yes  
  1. This table summarizes results from 18 regressions (nine for each outcome). Full regression output is provided in Additional file 1: Table S2
  2. All regressions are generalized linear models with a Poisson distribution and log link, and robust standard errors. All contain fixed effects for study arm (even when not shown here) and site. Month 1 N = 884; month 4 N = 892