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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