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Eekhout, I. (author), de Vet, H.C. (author), de Boer, M.R. (author), Twisk, J.W. (author), Heymans, M.W. (author)Previous studies showed that missing data in multi-item scales can best be handled by multiple imputation of item scores. However, when many scales are used, the number of items will become too large for the imputation model to reliably estimate imputations. A solution is to use passive imputation or a parcel summary score that combine and...article 2018
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Spriensma, A.S. (author), Eekhout, I. (author), de Boer, M.R. (author), Luime, J.J. (author), de Jong, P.H. (author), Bahçecitapar, M.K. (author), Heymans, M.W. (author), Twisk, J.W.R. (author)Background: Randomised controlled trials (RCTs) are the gold standard to estimate treatment effects. When patients receive effective treatment over time they may reach the limit of a certain measurement scale. This phenomenon is known as censoring and leads to skewed distributions of the outcome variable with an excess of either low (floor...article 2018
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van de Ven, H.A. (author), Klein Hesselink, J. (author), Bultmann, U. (author), de Boer, M.R. (author), de Looze, M.P. (author), van der Klink, J.J.L. (author), Brouwer, S. (author)The aim of this study was to examine which individual and work-related characteristics predict work outcomes related to sustainable employment among male shift and day workers. Methods Between 1 September 2005 and 31 December 2009, data on individual and work-related characteristics of N=5640 employees of Tata Steel in the Netherlands were...article 2014
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Simons, M. (author), Chinapaw, M.J. (author), van de Bovenkamp, M. (author), de Boer, M.R. (author), Seidell, J.C. (author), Brug, J. (author), de Vet, E. (author)Background: Excessive body weight, low physical activity and excessive sedentary time in youth are major public health concerns. A new generation of video games, the ones that require physical activity to play the games -i.e. active games- may be a promising alternative to traditional non-active games to promote physical activity and reduce...article 2014
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van Dijk, C.E. (author), de Boer, M.R. (author), Koppes, L.L.J. (author), Roos, J.C. (author), Lips, P. (author), Twisk, J.W.R. (author), TNO Kwaliteit van Leven (author)Introduction: Studies on the association of vitamin D and bone mineral density (BMD) in adolescence and young adults have shown contrasting results. None of these studies have examined the course and baseline in vitamin D intake. The purpose of this study was to examine the association between baseline and the course of dietary vitamin D intake...article 2009