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Figure 2 | BMC Medical Research Methodology

Figure 2

From: Effect of reminders on mitigating participation bias in a case-control study

Figure 2

ORs and 95% CIs for Campylobacter risk factors in final multivariable model, by mailing round. Crosses: model using controls returning a questionnaire before being sent a reminder; Closed circles: model using controls returning a questionnaire before being sent a second reminder; Open squares: model using all controls. All models are additionally adjusted for sex, age group, study site and month.

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