Research Topics
| Hendrik KoffijbergSummaryAffiliation: University Medical Center Utrecht Country: The Netherlands Publications
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Detail Information
Publications
From accuracy to patient outcome and cost-effectiveness evaluations of diagnostic tests and biomarkers: an exemplary modelling studyHendrik Koffijberg
Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, Mailstop STR 6 131, P O Box 85500, 3508, Utrecht, GA, The Netherlands
BMC Med Res Methodol 13:12. 2013..We demonstrate this by assessing the cost-effectiveness of modified transesophageal echocardiography (TEE) compared with manual palpation for the detection of atherosclerosis in the ascending aorta...- Communicating uncertainty in economic evaluations: verifying optimal strategiesH Koffijberg
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
Med Decis Making 32:477-87. 2012..The authors developed an extension of SLT that addresses these shortcomings... 
Subarachnoid haemorrhage in Sweden 1987-2002: regional incidence and case fatality ratesH Koffijberg
University Medical Centre Utrecht, Julius Centre for Health Sciences and Primary Care, STR 6 131 7 113, P O Box 85500, 3508 GA Utrecht, The Netherlands
J Neurol Neurosurg Psychiatry 79:294-9. 2008..Reliable estimates of age-specific case fatality rates are lacking. We analysed regional incidence rates and case fatality rates of SAH in Sweden...- Growth rates of intracranial aneurysms: exploring constancyHendrik Koffijberg
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, The Netherlands
J Neurosurg 109:176-85. 2008..Recent case reports have suggested that aneurysms grow fast in a short period of time. The authors of the present report investigated the plausibility of a constant growth rate for intracranial aneurysms... - Do intraindividual variation in disease progression and the ensuing tight window of opportunity affect estimation of screening benefits?Hendrik Koffijberg
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
Med Decis Making 29:82-90. 2009..The authors study the effects of intraindividual variation and the combined effects of inter- and intraindividual variation in disease progression on the effectiveness of screening... - Aneurysm occlusion in elderly patients with aneurysmal subarachnoid haemorrhage: a cost-utility analysisH Koffijberg
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Str 6 131, PO Box 85500, Utrecht 3508 GA, The Netherlands
J Neurol Neurosurg Psychiatry 82:718-27. 2011..With increasing age, overall prognosis decreases, and the complications of aneurysm occlusion increase. The balance of risks for aneurysm occlusion in elderly SAH patients in different age categories and clinical conditions is unknown... - Excess mortality and cardiovascular events in patients surviving subarachnoid hemorrhage: a nationwide study in SwedenDennis J Nieuwkamp
Department of Neurology, C03 236, University Medical Center Utrecht, PO Box 85500, 3584 CX Utrecht, The Netherlands
Stroke 42:902-7. 2011..We compared incidences of vascular diseases, vascular death, and all-cause death after SAH with those in the general population... - Optimal screening strategy for familial intracranial aneurysms: a cost-effectiveness analysisA Stijntje E Bor
Department of Neurology, Rudolf Magnus Institute of Neuroscience, University Medical Centre Utrecht, GA Utrecht, The Netherlands
Neurology 74:1671-9. 2010..Screening such individuals for intracranial aneurysms is advocated, but its effectiveness and cost-effectiveness are unknown, as are the optimal age ranges and interval for screening... - Cost-effectiveness of aspirin treatment in the primary prevention of cardiovascular disease events in subgroups based on age, gender, and varying cardiovascular riskJacoba P Greving
Julius Center for Health Sciences and Primary Care, Department of Neurology and Neurosurgery, University Medical Center Utrecht, Utrecht, Netherlands
Circulation 117:2875-83. 2008..We assessed the cost-effectiveness of aspirin separately for men and women of different ages with various levels of cardiovascular disease risk... - Common carotid intima-media thickness measurements in cardiovascular risk prediction: a meta-analysisHester M den Ruijter
Julius Center for Health Sciences and Primary Care, Heidelberglaan 100, 3584 CX, Utrecht, The Netherlands
JAMA 308:796-803. 2012..The evidence that measurement of the common carotid intima-media thickness (CIMT) improves the risk scores in prediction of the absolute risk of cardiovascular events is inconsistent... - Cost-effectiveness of magnetic resonance angiography versus intra-arterial digital subtraction angiography to follow-up patients with coiled intracranial aneurysmsJoanna D Schaafsma
Department of Neurology, Rudolf Magnus Institute of Neuroscience, University Medical Center, Utrecht, The Netherlands
Stroke 41:1736-42. 2010..We evaluated the cost-effectiveness of follow-up with MRA vs IA-DSA to assess whether in this setting MRA may replace IA-DSA... - Effectiveness and costs of screening for aneurysms every 5 years after subarachnoid hemorrhageMarieke J H Wermer
Department of Neurology G03 228, University Medical Center Utrecht, Heidelberglaan 100, 3500 GA Utrecht, The Netherlands
Neurology 70:2053-62. 2008..Patients who survive after subarachnoid hemorrhage (SAH) are at risk for a recurrence despite successful treatment of the ruptured aneurysm and may therefore benefit from screening for new aneurysms... 
Incorporating published univariable associations in diagnostic and prognostic modelingThomas P A Debray
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
BMC Med Res Methodol 12:121. 2012..abstract:..- Enhancing value of information analysesMart P Janssen
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
Value Health 12:935-41. 2009..The aim of this study was to demonstrate that it is feasible and recommendable to present value of information (VOI) outcomes in terms of underlying costs and effects in addition to costs alone... - Assessing performance of a randomized versus a non-randomized study designMaartje Raaijmakers
Department of Child and Adolescent Psychiatry, Rudolf Magnus Institute for Neuroscience, University Medical Centre Utrecht, The Netherlands
Contemp Clin Trials 29:293-303. 2008..The quality of this match was then compared with the quality which is to be expected from a randomized study... - Aggregating published prediction models with individual participant data: a comparison of different approachesThomas P A Debray
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
Stat Med 31:2697-712. 2012..Assessing the degree of heterogeneity between IPD and literature findings remains crucial to determine the optimal approach in aggregating previous evidence into new prediction models... - Multiple imputation of missing repeated outcome measurements did not add to linear mixed-effects modelsSanne A E Peters
Julius Center for Health Sciences and Primary Care, Stratenum 6 131, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX, Utrecht, The Netherlands
J Clin Epidemiol 65:686-95. 2012..To assess the added value of multiple imputation (MI) of missing repeated outcomes measures in longitudinal data sets analyzed with linear mixed-effects (LME) models... - Development and validation of clinical prediction models: marginal differences between logistic regression, penalized maximum likelihood estimation, and genetic programmingKristel J M Janssen
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
J Clin Epidemiol 65:404-12. 2012..However, there are several alternative methods to develop prediction models. We compared the accuracy of a model that predicts the presence of deep venous thrombosis (DVT) when developed by four different methods... - Individual participant data meta-analysis for a binary outcome: one-stage or two-stage?Thomas P A Debray
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
PLoS ONE 8:e60650. 2013..These are generally thought to produce similar results, but empirical comparisons are few... - Long-term health benefits and costs of measurement of carotid intima-media thickness in prevention of coronary heart diseaseHester M den Ruijter
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
J Hypertens 31:782-90. 2013..Our objective was to assess the currently unknown cost-effectiveness of CIMT measurements in primary prevention... - Lung cancer risk at low cumulative asbestos exposure: meta-regression of the exposure-response relationshipSjoukje van der Bij
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Heidelberglaan 100, Utrecht, The Netherlands
Cancer Causes Control 24:1-12. 2013..To assess the risk at low cumulative asbestos exposure, we provide new evidence by fitting flexible meta-regression models, a notably new and more robust method...