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  • Traumatic Brain and Spinal Cord Injury: Challenges and Developments
    Cristina Morganti-Kossmann, Ramesh Raghupathi, Andrew Maas
    ISBN: 9781107007437
    Publication date: July 2012
    Online ordering now available at: Cambridge University Press

Publications (62)

  • Individual participant data meta-analyses should not ignore clustering.
    Abo-Zaid G, Guo B, Deeks JJ, Debray TP, Steyerberg EW, Moons KG, Riley RD.
    J. Clin Epidemiol. 2013 Aug;66(8):865-873.e4. doi: 10.1016/j.jclinepi.2012.12.017. Epub 2013 May 4.
  • Prognosis Research Strategy (PROGRESS) 2: prognostic factor research.
    Riley RD, Hayden JA, Steyerberg EW, Moons KG, Abrams K, Kyzas PA, Malats N, Briggs A, Schroter S, Altman DG, Hemingway H; PROGRESS Group.
    PLoS Med. 2013;10(2):e1001380. doi: 10.1371/journal.pmed.1001380. Epub 2013 Feb 5.
  • Advancing care for traumatic brain injury: findings from the IMPACT studies and perspectives on future research. [Click for full publication in PDF]
    Maas AI, Murray GD, Roozenbeek B, Lingsma HF, Butcher I, McHugh GS, Weir J, Lu J, Steyerberg EW; for the International Mission on Prognosis Analysis of Clinical Trials in Traumatic Brain Injury (IMPACT) Study Group.
    Lancet Neurol. 2013 December ; 12(12): 1200–1210. doi:10.1016/S1474-4422(13)70234-5.
  • Making an IMPACT in traumatic brain injury research.
    Kochanek PM, Bell MJ.
    Lancet Neurol. 2013 Oct 16. doi:pii: S1474-4422(13)70245-X. 10.1016/S1474-4422(13)70245-X. [Epub ahead of print]
  • Prognosis in moderate and severe traumatic brain injury: External validation of the IMPACT models and the role of extracranial injuries.
    Lingsma H, Andriessen TM, Haitsema I, Horn J, van der Naalt J, Franschman G, Maas AI, Vos PE, Steyerberg EW.
    J Trauma Acute Care Surg. 2013 Feb;74(2):639-646.
  • Prognosis Research Strategy (PROGRESS) 3: Prognostic Model Research
    Steyerberg EW, Moons KGM, van der Windt DA, Hayden JA, Perel P, et al.
    PLoS Med 10(2): e1001381. doi:10.1371/journal.pmed.1001381
  • Covariate adjustment increased power in randomized controlled trials: an example in traumatic brain injury.
    Turner EL, Perel P, Clayton T, Edwards P, Hernández AV, Roberts I, Shakur H, Steyerberg EW, CRASH trial collaborators
    J Clin Epidemiol; 2012 May;65(5):474-81
  • Logistic random effects regression models: a comparison of statistical packages for binary and ordinal outcomes.
    Li B, Lingsma HF, Steyerberg EW, Lesaffre E
    BMC Med Res Methodol; 2011;11:77
  • Discrimination ability of prediction models for ordinal outcomes: Relationships between existing measures and a new measure.
    Ben Van Calster, Vanya Van Belle, Yvonne Vergouwe and Ewout W. Steyerberg
    Biometrical Journal 00 (2012) 0;1–12
  • New considerations in the design of clinical trials for traumatic brain injury
    Roozenbeek B, Lingsma H, Maas AIR
    Clin. Invest. 2012; 2 (2), 153-162
  • Does the extended Glasgow outcome scale add value to the conventional Glasgow outcome scale?
    Weir J, Steyerberg EW, Butcher I, Lu J, Lingsma HF, McHugh GS, Roozenbeek B, Maas AI, Murray GD.
    J Neurotrauma. Jan 1;29(1):53-8. 2012.
  • Prediction of outcome after moderate and severe traumatic brain injury: external validation of the IMPACT and CRASH prognostic models
    Roozenbeek B, Lingsma H, Lecky F, Lu J, Weir J, Butcher I, McHugh G, Murray GD, Perel P, Maas AIR, Steyerberg EW, on behalf of the International Mission on Prognosis and Analysis of Clinical Trials in Traumatic Brain Injury (IMPACT) Study Group, the Corticosteroid Randomisation After Significant Head Injury (CRASH) Trial Collaborators, and the Trauma Audit and Research Network (TARN)
    CCMed 2012; accepted for publication
  • Predicting 14-day mortality after severe traumatic brain injury: validity of the IMPACT models in the Brain Trauma Foundation TBI-trac® New York State database.
    Roozenbeek B, Chiu Y, Lingsma H, Gerber L, Steyerberg EW, Ghajar J, Maas AIR.
    J. Neurotrauma, 2011 Dec 9. [Epub ahead of print]
  • Impact of GOS Misclassification on Ordinal Outcome Analysis of Traumatic Brain Injury Clinical Trials
    Lu J, Marmarou A, Lapane KL. On Behalf Of The Impact Investigators
    J Neurotrauma. 2011 Sep 21. [Epub ahead of print]
  • Prognostic Value of Major Extracranial Injury in Traumatic Brain Injury: An Individual Patient Data Meta-analysis in 39,274 Patients
    van Leeuwen N, Lingsma HF, Perel P, Lecky F, Roozenbeek B, Lu J, Shakur H, Weir J, Steyerberg EW, Maas AI; On behalf of the IMPACT study group, the CRASH trial collaborators and the Trauma Audit and Research Network.
    Neurosurgery. 2011 Sep 5. [Epub ahead of print]
  • Between-centre differences and treatment effects in randomized controlled trials: A case study in traumatic brain injury
    Lingsma HF, Roozenbeek B, Perel P, Roberts I, Maas AI, Steyerberg EW.
    Trials. 2011 August 25; 12:201.
  • The added value of ordinal analysis in clinical trials: an example in traumatic brain injury
    Roozenbeek B, Lingsma HF, Perel P, Edwards P, Roberts I, Murray GD, Maas AI and Steyerberg EW for the IMPACT Study Group and the CRASH Trial Collaborators
    Crit Care. 2011 May 17;15(3):R127.
  • Large Between-Center Differences in Outcome After Moderate and Severe Traumatic Brain Injury in the International Mission on Prognosis and Clinical Trial Design in Traumatic Brain Injury
    Lingsma HF, Roozenbeek B, Li B, Lu J, Weir J, Butcher I, Marmarou A, Murray GD, Maas AI, Steyerberg EW.
    J Neurosurgery 2011 March;68(3):601-608.
  • Standardizing Data Collection in Traumatic Brain Injury
    Maas AI, Harrison-Felix CL, Menon D, Adelson PD, Balkin T, Bullock R, Engel DC, Gordon W, Langlois-Orman J, Lew HL, Robertson C, Temkin N, Valadka A, Verfaellie M, Wainwright M, Wright DW, Schwab K.
    J Neurotrauma 2011 Febr;28(2):177-187.
  • Covariate adjustment increases statistical power in randomized controlled trials
    On Behalf Of The Impact Investigators, Lingsma H, Roozenbeek B, Steyerberg E.
    J Clin Epidemiol. 2010 Aug 27.
  • Common Data Elements for Traumatic Brain Injury: Recommendations From the Interagency Working Group on Demographics and Clinical Assessment
    Maas AI, Harrison-Felix CL, Menon D, Adelson PD, Balkin T, Bullock R, Engel DC, Gordon W, Langlois Orman J, Lew H, Robertson C, Temkin N, Valadka A, Verfaellie M, Wainwright M, Wright DW, Schwab K.
    Archives of physical medicine and rehabilitation 1 November 2010 (volume 91 issue 11 Pages 1641-1649 DOI: 10.1016/j.apmr.2010.07.232)
  • Position Statement: Definition of Traumatic Brain Injury
    Menon D, Schwab K, Wright DW, Maas AI.
    Archives of physical medicine and rehabilitation 1 November 2010 (volume 91 issue 11 Pages 1637-1640 DOI: 10.1016/j.apmr.2010.05.017)
  • Concepts in cancer survival analysis: Research questions, data, and models
    Steyerberg EW.
    Surg Oncol. 2010 June; 19(2): 52-54.
  • External Validity of Risk Models: Use of Benchmark Values to Disentangle a Case-Mix Effect From Incorrect Coefficients
    Vergouwe Y, Moons K, Steyerberg E.
    American Journal of Epidemiology, 2010 Jun 17.
  • Underpowered trials in critical care medicine: how to deal with them?
    Roozenbeek B, Lingsma HF, Steyerberg EW, Maas AI.
    Crit Care. 2010;14(3):423. Epub 2010 Jun 8.
  • A method for reducing misclassification in the extended Glasgow Outcome Score
    Lu J, Marmarou A, Lapane K, Turf E, Wilson L; IMPACT Group; American Brain Injury Consortium Study Participation Centers.
    J Neurotrauma. 2010 May;27(5):843-52.
  • Early prognosis in Traumatic Brain Injury: from prophecies to predictions
    Lingsma HF, Roozenbeek B, Steyerberg EW, Murray GD, Maas AI.
    Lancet Neurology 2010;9:543-554.
  • Meta-analysis of a binary outcome using individual participant data and aggregate data
    Riley RD, Steyerberg EW.
    Res Syn Meth 2010 (published online)
  • A simulation study evaluating approaches to the analysis of ordinal outcome data in randomized controlled trials in traumatic brain injury: results from the IMPACT Project
    McHugh GS, Butcher I, Steyerberg EW, Marmarou A, Lu J, Lingsma HF, Weir J, Maas AI, Murray GD.
    Clin Trials. 2010;7(1):44-57.
  • IMPACT Recommendations for Improving the Design and Analysis of Clinical Trials in Moderate to Severe Traumatic Brain Injury
    Maas AI, Steyerberg EW, Marmarou A, McHugh GS, Lingsma HF, Butcher I, Lu J, Weir J, Roozenbeek B, Murray GD.
    Neurotherapeutics. 2010 Jan;7(1):127-134.
  • Clinical Trials in Traumatic Brain Injury: Past Experience and Current Developments
    Maas AI, Roozenbeek B, Manley GT.
    Neurotherapeutics. 2010 Jan;7(1):115-126.
  • Standardisation of data collection in traumatic brain injury: key to the future?
    Maas A.
    Critical Care 2009;13 no 6.
  • Prognosestelling bij middelzwaar en ernstig schedel-hersenletsel*
    Hester F. Lingsma, Andrew I.R. Maas en Ewout W. Steyerberg
    Ned Tijdschr Geneeskd. 2010;154:A739
  • The influence of enrolment criteria on recruitment and outcome distribution in traumatic brain injury studies: results from the IMPACT study
    Roozenbeek B, Marmarou A, Butcher I, Lingsma HF, Lu J, McHugh GS, Murray GM, Weir J, Steyerberg EW.
    J Neurotrauma 2009;26(7):1069-75.
  • Baseline characteristics and statistical power in RCTs: selection, prognostic targeting, or covariate adjustment?
    Roozenbeek B, Maas AIR, Lingsma HF, Butcher I, Lu J, Marmarou A, McHugh GS, Weir J, Murray GD, Steyerberg EW.
    Critical Care Medicine 2009; aug 24.
  • Predicting outcome after traumatic brain injury: development and international validation of prognostic scores based on admission characteristics
    Steyerberg EW, Mushkudiani N, Perel P, Butcher I, Lu J, McHugh GS, Murray GD, Marmarou A, Roberts I, Habbema JD, Maas AI.
    PLoS Med. 2008 Aug 5(8):e165.
  • New approaches to increase statistical power in TBI trials: insights from the IMPACT study
    Maas AI, Lingsma HF; IMPACT study group.
    Acta Neurochir Suppl. 2008;101:119-24.
  • Classification of traumatic brain injury for targeted therapies
    Saatman KE, Duhaime AC, Bullock R, Maas AI, Valadka A, Manley GT; Workshop Scientific Team and Advisory Panel Members.
    J Neurotrauma 2008 Jul;25(7);719-38.
  • Effects of Glasgow Outcome Scale misclassification on traumatic brain injury clinical trials
    Lu J, Murray GD, Steyerberg EW, Butcher I, McHugh GS, Lingsma H, Mushkudiani N, Choi S, Maas AI, Marmarou A.
    J Neurotrauma 2008 Jun;25(6):641-51.
  • A systematic review finds methodological improvements necessary for prognostic models in determining traumatic brain injury outcomes
    Mushkudiani NA, Hukkelhoven CW, Hernández AV, Murray GD, Choi SC, Maas AI, Steyerberg EW.
    J Clin Epidemiol. 2008 Apr;61(4):331-43.
  • Predicting outcome after traumatic brain injury: practical prognostic models based on large cohort of international patients
    MRC CRASH Trial Collaborators, Perel P, Arango M, Clayton T, Edwards P, Komolafe E, Poccock S, Roberts I, Shakur H, Steyerberg E, Yutthakasemsunt S.
    BMJ. 2008;336:425-9.
  • Prognosis and clinical trial design in traumatic brain injury: the IMPACT study
    Maas AI, Marmarou A, Murray GD, Teasdale SG, Steyerberg EW.
    J Neurotrauma. 2007 Feb;24(2):232-8. Review.
  • IMPACT database of traumatic brain injury: design and description
    Marmarou A, Lu J, Butcher I, McHugh GS, Mushkudiani NA, Murray GD, Steyerberg EW, Maas AI.
    J Neurotrauma. 2007 Feb;24(2):239-50.
  • Statistical approaches to the univariate prognostic analysis of the IMPACT database on traumatic brain injury
    McHugh GS, Butcher I, Steyerberg EW, Lu J, Mushkudiani N, Marmarou A, Maas AI, Murray GD.
    J Neurotrauma. 2007 Feb;24(2):251-8.
  • Prognostic value of demographic characteristics in traumatic brain injury: results from the IMPACT study
    Mushkudiani NA, Engel DC, Steyerberg EW, Butcher I, Lu J, Marmarou A, Slieker F, McHugh GS, Murray GD, Maas AI.
    J Neurotrauma. 2007 Feb;24(2):259-69.
  • Prognostic value of the Glasgow Coma Scale and pupil reactivity in traumatic brain injury assessed pre-hospital and on enrollment: an IMPACT analysis
    Marmarou A, Lu J, Butcher I, McHugh GS, Murray GD, Steyerberg EW, Mushkudiani NA, Choi S, Maas AI.
    J Neurotrauma. 2007 Feb;24(2):270-80.
  • Prognostic value of computerized tomography scan characteristics in traumatic brain injury: results from the IMPACT study
    Maas AI, Steyerberg EW, Butcher I, Dammers R, Lu J, Marmarou A, Mushkudiani NA, McHugh GS, Murray GD.
    J Neurotrauma. 2007 Feb;24(2):303-14.
  • Prognostic value of admission blood pressure in traumatic brain injury: results from the IMPACT study
    Butcher I, Maas AI, Lu J, Marmarou A, Murray GD, Mushkudiani NA, McHugh GS, Steyerberg EW.
    J Neurotrauma. 2007 Feb;24(2):294-302.
  • Prognostic value of secondary insults in traumatic brain injury: results from the IMPACT study
    McHugh GS, Engel DC, Butcher I, Steyerberg EW, Lu J, Mushkudiani N, Hernández AV, Marmarou A, Maas AI, Murray GD.
    J Neurotrauma. 2007 Feb;24(2):287-93.
  • Prognostic value of cause of injury in traumatic brain injury: results from the IMPACT study
    Butcher I, McHugh GS, Lu J, Steyerberg EW, Hernández AV, Mushkudiani N, Maas AI, Marmarou A, Murray GD.
    J Neurotrauma. 2007 Feb;24(2):281-6.
  • Prognostic value of admission laboratory parameters in traumatic brain injury: results from the IMPACT study
    Van Beek JG, Mushkudiani NA, Steyerberg EW, Butcher I, McHugh GS, Lu J, Marmarou A, Murray GD, Maas AI.
    J Neurotrauma. 2007 Feb;24(2):315-28.
  • Multivariable prognostic analysis in traumatic brain injury: results from the IMPACT study
    Murray GD, Butcher I, McHugh GS, Lu J, Mushkudiani NA, Maas AI, Marmarou A, Steyerberg EW.
    J Neurotrauma. 2007 Feb;24(2):329-37.
  • Some prognostic models for traumatic brain injury were not valid
    Hukkelhoven CW, Rampen AJ, Maas AI, Farace E, Habbema JD, Marmarou A, Marshall LF, Murray GD, Steyerberg EW.
    J Clin Epidemiol. 2006 Feb;59(2):132-43.
  • Adjustment for strong predictors of outcome in traumatic brain injury trials: 25% reduction in sample size requirements in the IMPACT study
    Hernández AV, Steyerberg EW, Butcher I, Mushkudiani N, Taylor GS, Murray GD, Marmarou A, Choi SC, Lu J, Habbema JD, Maas AI.
    J Neurotrauma. 2006 Sep;23(9):1295-303.
  • Randomized controlled trials with time-to-event outcomes: how much does prespecified covariate adjustment increase power?
    Hernández AV, Eijkemans MJ, Steyerberg EW.
    Ann Epidemiol. 2006 Jan;16(1):41-8. Epub 2005 Nov 7.
  • Mortality from traumatic brain injury
    Lu J, Marmarou A, Choi S, Maas A, Murray G, Steyerberg EW, IMPACT and ABIC Study Group.
    Acta Neurochir Suppl 2005;95:218-5.
  • Design and analysis of phase III trials with ordered outcome scales: the concept of the sliding dichotomy
    Murray GD, Barer D, Choi S, Fernandes H, Gregson B, Lees KR, Maas AI, Marmarou A, Mendelow AD, Steyerberg EW, Taylor GS, Teasdale GM, Weir CJ.
    J Neurotrauma. 2005 May;22(5):511-7. Review.
  • Subgroup analysis and covariate adjustment in randomized clinical trials of traumatic brain injury: a systematic review
    Hernández AV, Steyerberg EW, Taylor GS, Marmarou A, Habbema JD, Maas AI.
    Neurosurgery. 2005 Dec;57(6):1244-53.
  • Predicting outcome after traumatic brain injury: development and validation of a prognostic score based on admission characteristics
    Hukkelhoven CW, Steyerberg EW, Habbema JD, Farace E, Marmarou A, Murray GD, Marshall LF, Maas AI.
    J Neurotrauma. 2005 Oct;22(10):1025-39.
  • Prediction of outcome in traumatic brain injury with computed tomographic characteristics: a comparison between the computed tomographic classification and combinations of computed tomographic predictors
    Maas AI, Hukkelhoven CW, Marshall LF, Steyerberg EW.
    Neurosurgery. 2005 Dec;57(6):1173-82; discussion 1173-82.
  • Clinical trials in traumatic brain injury: current problems and future solutions
    Maas AI, Marmarou A, Murray GD, Steyerberg EW.
    Acta Neurochir Suppl. 2004;89:113-8.
  • Covariate adjustment in RCT's with dichotomous outcomes increases statistical power and reduces sample size requirements
    A.V. Hernández et al
    J. Clin Epidemiol 2004; 57 (5): 454-60.

PhD Thesis (6)

  • Randomized clinical trials in heterogeneous population
    A. Hernández (22 Febr 2006)
    Erasmus MC Rotterdam, NL.
  • Prognosis of traumatic brain injury
    C. Hukkelhoven (Dec 2005)
    Erasmus MC Rotterdam, NL.
  • Measuring quality of care - methods and applications to acute neurological diseases
    Hester Lingsma (Nov 2010)
    Erasmuc MC Rotterdam, NL.
  • Efficient analysis of ordinal data from clinical trials in head injury
    Gillian McHugh (Sept 2011)
    The University of Edinburgh, UK
  • Design and analysis of clinical trials in Traumatic Brain Injury. (Preliminary Title)
    Bob Roozenbeek (Spring 2012)
    European PhD thesis; Joint doctorate Erasmus University Rotterdam and Antwerp University.
  • The effects of Glasgow Outcome Scale Misclassification on Traumatic Brain Injury Clinical trials
    Juan Lu (May 2010)
    Richmond VA, US