Publicaties
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Change in unit-level job attitudes following strategic interventions: A meta-analysis of longitudinal studies Vrije Universiteit Brussel
The present meta-analysis tests how cost- and people-oriented strategic interventions impact temporal-dynamic changes in unit-level job attitudes within organizations. Analyses are based on 573 effect sizes across 137 longitudinal studies containing unit-level change in job attitudes across three time periods (pre-change, during change, and post-change). Results reveal that unit-level job attitudes (a) decline during cost-oriented changes ...
Estimation of controlled direct effects in longitudinal mediation analyses with latent variables in randomized studies Universiteit Gent
Analysis of longitudinal studies with repeated outcome measures : adjusting for time-dependent confounding using conventional methods Universiteit Gent
Implementation of longitudinal insulin kinetic studies in busy field settings in Uganda : experience from the 'glucose metabolism changes in Ugandan HIV patients on dolutegravir based anti-retroviral therapy' (GLUMED study) Universiteit Gent Universiteit Antwerpen
Review of 30 years of longitudinal studies on the association between job insecurity and health and well-being: Is there causal evidence? KU Leuven
Objective In this review article, we present an overview of the results of longitudinal studies on the consequences of job insecurity for health and well-being. We discuss the evidence for normal causation (“Does job insecurity influence outcomes?”), reversed causation (“Do specific outcomes predict job insecurity?”), and reciprocal causation. We also review the various theories used to develop the hypotheses and whether theory has been used at ...
Longitudinal studies in rheumatology: some guidance for analysis KU Leuven
In a follow-up study, patients are monitored over time. Longitudinal and time-to-event studies are the two most important types of a follow-up study. In this paper, the focus is on longitudinal studies with a continuous response where patients are examined at several time points. While longitudinal studies provide a powerful tool for the evaluation of a treatment effect over time, a major problem is missing data caused, for example, by patients ...
Managing Social Adoption and Technology Adaption in Longitudinal Studies of Mobile Media Applications Vrije Universiteit Brussel
In this paper we present a case study of a longitudinal in-situ observation that involves a new social application for mobile communication. Our study demonstrates the need for an adaptive approach to planning, design, and implementation that is responsive to emerging social and infrastructure conditions. This represents a shift from traditional longitudinal studies that observe prototype systems with fixed sets of affordances. In the case of ...
A Two-Stage Joint Model for Nonlinear Longitudinal Response and a Time-to-Event with Application in Transplantation Studies KU Leuven
In transplantation studies, often longitudinal measurements are collected for important markers prior to the actual transplantation. Using only the last available measurement as a baseline covariate in a survival model for the time to graft failure discards the whole longitudinal evolution. We propose a two-stage approach to handle this type of data sets using all available information. At the first stage, we summarize the longitudinal ...
Strategies for handling missing data in longitudinal studies with questionnaires Universiteit Hasselt KU Leuven
Missing data methods, maximum likelihood estimation (MLE) and multiple imputation (MI), for longitudinal questionnaire data were investigated via simulation. Predictive mean matching (PMM) was applied at both item and scale levels, logistic regression at item level and multivariate normal imputation at scale level. We investigated a hybrid approach which is combination of MLE and MI, i.e. scales from the imputed data are eliminated if all ...