Multi-item questionnaire

Including auxiliary item information in longitudinal data analyses improved handling missing questionnaire outcome data

© 2015 Elsevier Inc. All rights reserved. Objectives Previous studies show that missing values in multi-item questionnaires can best be handled at item score level. The aim of this study was to demonstrate two novel methods for dealing with …

Missing data in a multi-item instrument were best handled by multiple imputation at the item score level

Objectives Regardless of the proportion of missing values, complete-case analysis is most frequently applied, although advanced techniques such as multiple imputation (MI) are available. The objective of this study was to explore the performance of …