What question did this study set out to answer?

To explore the effects of interview mode on symptom reporting in a COVID-19-related questionnaire survey.

March 14, 2026JMIR Human Factors0 citationsOpen Access

Mode Effects Between Telephone and Web Interviews in the Post-COVID-19 Questionnaire Survey CoVerlauf: Exploratory Study

PHPaula Sofia Herrera-Espejel HPHermann Pohlabeln LKLisa Kühne

Key Points

To explore the effects of interview mode on symptom reporting in a COVID-19-related questionnaire survey.
Conducted interviews via web and telephone modes.
Analyzed reported symptoms using different formats: multiple choice (MC) and free text.
Considered selection and measurement effects during analysis.
Telephone interviews resulted in higher symptom reports than web interviews.
Both selection and measurement effects contributed to increased symptom reporting.
No significant impact of interview mode on overall findings of the CoVerlauf study.

Abstract

Our results suggest that interviews via CATI resulted in higher numbers of reported symptoms collected via MC and free text and that both selection and measurement effects contributed to this increase. However, no evidence was found that the interview mode affected the overall findings of the CoVerlauf study.

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