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

Journal of Clinical Epidemiology
Iris EekhoutMartijn W Heymans

Abstract

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 incomplete item scores in outcome variables in longitudinal studies. The performance of these methods was previously examined in a simulation study. The two methods incorporate item information at the background when simultaneously the study outcomes are estimated. The investigated methods include the item scores or a summary of a parcel of available item scores as auxiliary variables while using the total score of the multi-item questionnaire as the main focus of the analysis in a latent growth model. That way the items help estimating the incomplete information of the total scores. The methods are demonstrated in two empirical data sets. Including the item information results in more precise outcomes in terms of regression coefficient estimates and standard errors, compared with not including item information in the analysis. The inclusion of a parcel summary is an efficient method that does not overcomplicate longitudinal growth estimates. Therefore, it is recommended in situations where multi-item questionnaires are used as outcome measure...Continue Reading

References

Jan 22, 2004·International Journal of Behavioral Medicine·Floris W Kraaimaat, Andrea W M Evers
Apr 11, 2012·International Journal of Vascular Medicine·Johannes B Dahm, Frank van Buuren
May 16, 2012·Epidemiology·Iris EekhoutMartijn W Heymans
Dec 3, 2013·Journal of Clinical Epidemiology·Iris EekhoutMartijn W Heymans

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Citations

Oct 4, 2016·Journal of Medical Internet Research·Chris GibbonsSuzanne Skevington
Jan 1, 2018·Structural Equation Modeling : a Multidisciplinary Journal·Linying JiE Mark Cummings

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