Questionnaire Breakoff and Item Nonresponse in Web-Based Questionnaires: Multilevel Analysis of Person-Level and Item Design Factors in a Birth Cohort

Cauane Blumenberg   ^{1 *} , MSc ;   Daniela Zugna   ^{2 *} , PhD ;   Maja Popovic   ^{2 *} , MSc ;   Costanza Pizzi   ^{2 *} , PhD ;   Aluisio J D Barros   ^{1 *} , PhD ;   Lorenzo Richiardi   ^{2 *} , PhD

¹ Center for Epidemiological Research, Post-Graduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil

² Cancer Epidemiology Unit, Department of Medical Sciences, University of Turin, Turin, Italy

*all authors contributed equally