{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T00:11:46Z","timestamp":1788999106594,"version":"build-2803163510"},"reference-count":62,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,4,19]],"date-time":"2021-04-19T00:00:00Z","timestamp":1618790400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"AGITOS Foundation (International Paralympic Committee) and the Cerebral Palsy International Sports and Recreation Association (CPISRA)","award":["GSP14-CPISRA01-IF"],"award-info":[{"award-number":["GSP14-CPISRA01-IF"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>This study aimed (1) to determine the appropriateness of using decision trees as a classification tool for determining the allocation of sport classes of para-footballers with \u201cmoderate vs. mild\u201d cerebral palsy (CP) profiles of spastic diplegia\/hemiplegia and ataxia\/athetosis based on observational outcomes by international classifiers, and (2) to identify what key observational features were relevant to discriminating among different impairment levels. A sample of 16 experienced international classifiers from five world regions participated in this study, observing activity limitation of a final sample of 21 international CP footballers when performing 16 gross-motor and sports-specific tests for balance (n = 3), coordination (n = 5), running, accelerations and decelerations (n = 3), jumping (n = 4), and change of direction ability (n = 1). For the overall sample (336 observations), the model included eight decision nodes and 24 branches with 17 leaves, including side-step, side-stepping, and triple hop as the tests with the best sensitivity (precision = 67.0%). For those with spastic diplegia (64 observations: Two nodes, six branches with five leaves), the range of motion in the side-step test and the balance in the tandem walk tests correctly classified 89.1% of the observations. In those with athetosis and ataxia (96 observations), the model included five nodes, 15 branches, and 11 leaves (176 observations, precision = 86.5%). For those with spastic hemiplegia, a model containing two nodes, six branches, and five leaves had 90.9% accuracy, including observational features of balance in the side-step test and symmetry in the side-stepping test. The observational tool used in this study, based on the impact of specific impairment measurements of hypertonia, athetosis, and ataxia, can be used to determine which assessments are more appropriate for discriminating between functional profiles in para-footballers with CP.<\/jats:p>","DOI":"10.3390\/ijerph18084320","type":"journal-article","created":{"date-parts":[[2021,4,19]],"date-time":"2021-04-19T11:21:38Z","timestamp":1618831298000},"page":"4320","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Using Decision Trees to Support Classifiers\u2019 Decision-Making about Activity Limitation of Cerebral Palsy Footballers"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1917-6634","authenticated-orcid":false,"given":"Jos\u00e9 M.","family":"Sarabia","sequence":"first","affiliation":[{"name":"Sport Research Centre, Department of Sports Sciences, Miguel Hern\u00e1ndez University, 03202 Elche, Spain"},{"name":"Alicante Institute for Health and Biomedical Research (ISABIAL Foundation), 03010 Alicante, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5232-5825","authenticated-orcid":false,"given":"Alba","family":"Roldan","sequence":"additional","affiliation":[{"name":"Sport Research Centre, Department of Sports Sciences, Miguel Hern\u00e1ndez University, 03202 Elche, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4392-1099","authenticated-orcid":false,"given":"Mat\u00edas","family":"Henr\u00edquez","sequence":"additional","affiliation":[{"name":"Sport Research Centre, Department of Sports Sciences, Miguel Hern\u00e1ndez University, 03202 Elche, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0279-7802","authenticated-orcid":false,"given":"Raul","family":"Reina","sequence":"additional","affiliation":[{"name":"Sport Research Centre, Department of Sports Sciences, Miguel Hern\u00e1ndez University, 03202 Elche, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,19]]},"reference":[{"key":"ref_1","unstructured":"International Paralympic Committee (IPC) (2020, December 30). International Standard for Eligible Impairments. Available online: https:\/\/www.paralympic.org\/sites\/default\/files\/document\/161004145727129_2016_10_04_%0AInternational_Standard_for_Eligible_Impairments_1.pdf."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"496","DOI":"10.1111\/sms.13583","article-title":"Activity limitation and match load in para-footballers with cerebral palsy: An approach for evidence-based classification","volume":"30","author":"Reina","year":"2020","journal-title":"Scand. J. Med. Sci. Sport."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"313","DOI":"10.1016\/j.pmr.2018.01.010","article-title":"Applying scientific principles to enhance Paralympic classification now and in the future: A research primer for rehabilitation specialists","volume":"29","author":"Tweedy","year":"2018","journal-title":"Phys. Med. Rehabil. Clin. N. Am."},{"key":"ref_4","unstructured":"Durstine, J.L., Moore, G.E., Painter, P.L., and Roberts, S.O. (2009). ACSM\u2019s Exercise Management for Persons with Chronic Diseases and Disabilities, Human Kinetics. [3th ed.]."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Reina, R., Elvira, J., Valverde, M., Rold\u00e1n, A., and Yanci, J. (2019). Kinematic and kinetic analyses of the vertical jump with and without header as performed by para-footballers with cerebral palsy. Sports, 7.","DOI":"10.3390\/sports7090209"},{"key":"ref_6","unstructured":"World Para Athletics (WPA) (2020, December 28). Classification Rules and Regulations. Available online: https:\/\/www.paralympic.org\/sites\/default\/files\/document\/180305152713114_2017_12_20++WPA+Classification+Rules+and+Regulations_Edition+2018+online+version+.pdf."},{"key":"ref_7","first-page":"161","article-title":"Evidence-based classification in Paralympic sport: Application to football-7-a-side","volume":"32","author":"Reina","year":"2014","journal-title":"Eur. J. Hum. Mov."},{"key":"ref_8","unstructured":"International Federation of Cerebral Palsy Football (IFCPF) (2020, December 24). Classification Rules and Regulations. Available online: https:\/\/www.ifcpf.com\/about-classification."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1093\/ptj\/67.2.206","article-title":"Interrater reliability of a modified ashworth scale of muscle spasticity","volume":"67","author":"Bohannon","year":"1987","journal-title":"Phys. Ther."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1633","DOI":"10.1002\/mds.21544","article-title":"Reliability and validity of the scale for the assessment and rating of ataxia: A study in 64 ataxia patients","volume":"22","author":"Weyer","year":"2007","journal-title":"Mov. Disord."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1111\/j.1469-8749.2011.04209.x","article-title":"The Dyskinesia Impairment Scale: A new instrument to measure dystonia and choreoathetosis in dyskinetic cerebral palsy","volume":"54","author":"Monbaliu","year":"2012","journal-title":"Dev. Med. Child Neurol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"391","DOI":"10.1016\/j.jsams.2016.08.010","article-title":"Assessing muscle strength for the purpose of classification in Paralympic sport: A review and recommendations","volume":"20","author":"Beckman","year":"2017","journal-title":"J. Sci. Med. Sport"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Tweedy, S.M., Mann, D., and Vanlandewijck, Y.C. (2016). Research needs for the development of evidence-based systems of classification for physical, vision, and intellectual impairments. Training and Coaching the Paralympic Athlete, John Wiley & Sons, Ltd.","DOI":"10.1002\/9781119045144.ch7"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"710","DOI":"10.1016\/j.jsams.2020.01.003","article-title":"Evaluation of the bilateral function in para-athletes with spastic hemiplegia: A model-based clustering approach","volume":"23","author":"Reina","year":"2020","journal-title":"J. Sci. Med. Sport"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1403","DOI":"10.1080\/02640414.2018.1560617","article-title":"A mathematical model for decision-making in the classification of para-footballers with different severity of coordination impairments","volume":"37","author":"Pastor","year":"2019","journal-title":"J. Sports Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"597","DOI":"10.1123\/ijspp.2017-0321","article-title":"Vertical and horizontal jump capacity in international cerebral palsy football players","volume":"13","author":"Reina","year":"2018","journal-title":"Int. J. Sports Physiol. Perform."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"409","DOI":"10.3389\/fphys.2015.00409","article-title":"Change of direction ability performance in cerebral palsy football players according to functional profiles","volume":"6","author":"Reina","year":"2016","journal-title":"Front. Physiol."},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Reina, R., Sarabia, J.M., Caballero, C., and Yanci, J. (2017). How does the ball influence the performance of change of direction and sprint tests in para-Footballers with brain impairments? Implications for evidence-based classification in CP-Football. PLoS ONE, 12.","DOI":"10.1371\/journal.pone.0187237"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Daniel, L.F., Reina, R., Gorla, J.I., Bastos, T., and Roldan, A. (2020). Validity and reliability of a test battery to assess change of directions with ball dribbling in para-footballers with cerebral palsy. Brain Sci., 10.","DOI":"10.3390\/brainsci10020074"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"669","DOI":"10.1080\/17461391.2015.1132775","article-title":"How much does lower body strength impact Paralympic running performance?","volume":"16","author":"Beckman","year":"2016","journal-title":"Eur. J. Sport Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1007\/s12283-016-0199-5","article-title":"Developing tests of impaired coordination for Paralympic classification: Normative values and test\u2013retest reliability","volume":"19","author":"Connick","year":"2016","journal-title":"Sports Eng."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1016\/j.jsams.2018.11.015","article-title":"Classifying motor coordination impairment in Para swimmers with brain injury","volume":"22","author":"Hogarth","year":"2019","journal-title":"J. Sci. Med. Sport"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"362","DOI":"10.1016\/j.gaitpost.2018.02.004","article-title":"The influence of lower limb impairments on RaceRunning performance in athletes with hypertonia, ataxia or athetosis","volume":"61","author":"Jahed","year":"2018","journal-title":"Gait Posture"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1007\/978-3-030-32622-7_21","article-title":"Decision trees and applications","volume":"1194","author":"Karalis","year":"2020","journal-title":"Adv. Exp. Med. Biol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3389\/fpsyg.2018.00950","article-title":"Contrast sensitivity is a significant predictor of performance in rifle shooting for athletes with vision impairment","volume":"9","author":"Allen","year":"2018","journal-title":"Front. Psychol."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Krabben, K., Mashkovskiy, E., Ravensbergen, H.J.C. (Rianne), and Mann, D.L. (2020). May the best-sighted win? The relationship between visual function and performance in para judo. J. Sports Sci., 1\u201310.","DOI":"10.1080\/02640414.2020.1851899"},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Palisano, R.J., Rosenbaum, P., Bartlett, D., and Livingston, M.H. (2008). Content validity of the expanded and revised gross motor function classification system. Dev. Med. Child Neurol.","DOI":"10.1111\/j.1469-8749.2008.03089.x"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Roldan, A., Sarabia, J.M., G\u00f3mez-Marcos, G., and Reina, R. (2020). An observational tool to assess activity limitation in ambulatory people with cerebral palsy when performing motor skills. Int. J. Environ. Res. Public Health, 17.","DOI":"10.3390\/ijerph17061896"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"340","DOI":"10.1191\/0269215506cr949oa","article-title":"A new clinical test of dynamic standing balance in the frontal plane: The side-step test","volume":"20","author":"Fujisawa","year":"2006","journal-title":"Clin. Rehabil."},{"key":"ref_30","unstructured":"Bicici, S., Vanlandewijck, Y., and Tweedy, S.M. (2012). Development of a Test Battery for Improving Classification Reliability for Ambulant Athletes Affected by Hypertonia, Ataxia or Athetosis. [Master\u2019s Thesis, KU Leuven]."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1067","DOI":"10.1136\/bjsm.2009.061804","article-title":"Towards Evidence-based classification in Paralympic athletics: Evaluating the validity of activity limitation tests for use in classification of Paralympic running events","volume":"43","author":"Beckman","year":"2009","journal-title":"Br. J. Sports Med."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Reina, R., Barbado, D., Hern\u00e1ndez-Dav\u00f3, H., and Roldan, A. (2021). Dynamic and static stability in para-athletes with cerebral palsy considering their impairment profile. PM&R.","DOI":"10.1002\/pmrj.12579"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"2167","DOI":"10.1519\/JSC.0b013e3181b439f0","article-title":"Test-retest reliability and minimal detectable change of the hexagon agility test","volume":"23","author":"Beekhuizen","year":"2009","journal-title":"J. Strength Cond. Res."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Yanci, J., Castillo, D., Iturricastillo, A., Aracama, A., Roldan, A., and Reina, R. (2021). Performance analysis in football-specific tests by para-footballers with cerebral palsy: Implications for evidence-based classification. Int. J. Sports Physiol. Perform.","DOI":"10.1123\/ijspp.2020-0370"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1008","DOI":"10.1046\/j.1365-2648.2000.t01-1-01567.x","article-title":"Research guidelines for the Delphi survey technique","volume":"32","author":"Hasson","year":"2000","journal-title":"J. Adv. Nurs."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"386","DOI":"10.1136\/bjsports-2015-095434","article-title":"Expert consensus statement to guide the evidence-based classification of Paralympic athletes with vision impairment: A Delphi study","volume":"50","author":"Ravensbergen","year":"2016","journal-title":"Br. J. Sports Med."},{"key":"ref_37","unstructured":"Hall, M.A. (1998). Correlation-Based Feature Subset Selection for Machine Learning. [Ph.D. Thesis, University of Waikato]."},{"key":"ref_38","first-page":"234","article-title":"Supervised machine learning approaches for medical data set classification\u2014A review","volume":"2","author":"Anto","year":"2011","journal-title":"Int. J. Comput. Sci. Technol."},{"key":"ref_39","unstructured":"Quinlan, J.R. (2014). C4.5: Programs for Machine Learning, Elsevier."},{"key":"ref_40","unstructured":"Breiman, L., Friedman, J.H., Olshen, R.A., and Stone, C.J. (1984). Classification and Regression Trees, Wadsworth & Brooks\/Cole Advanced Books & Software."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Refaeilzadeh, P., Tang, L., and Liu, H. (2009). Cross-validation. Encyclopedia of Database Systems, Springer.","DOI":"10.1007\/978-0-387-39940-9_565"},{"key":"ref_42","first-page":"249","article-title":"Assessing agreement on classification tasks: The Kappa statistic","volume":"22","author":"Carletta","year":"1996","journal-title":"Comput. Linguist."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"367","DOI":"10.1016\/j.compbiolchem.2004.09.006","article-title":"Comparing two K-category assignments by a K-category correlation coefficient","volume":"28","author":"Gorodkin","year":"2004","journal-title":"Comput. Biol. Chem."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"442","DOI":"10.1016\/0005-2795(75)90109-9","article-title":"Comparison of the predicted and observed secondary structure of T4 phage lysozyme","volume":"405","author":"Matthews","year":"1975","journal-title":"BBA Protein Struct."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1016\/j.gheart.2013.01.001","article-title":"Cardiovascular disease risk assessment: Insights from Framingham","volume":"8","author":"Pencina","year":"2013","journal-title":"Glob. Heart"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"183","DOI":"10.1080\/09638280500158422","article-title":"The epidemiology of cerebral palsy: Incidence, impairments and risk factors","volume":"28","author":"Odding","year":"2006","journal-title":"Disabil. Rehabil."},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Reina, R., Iturricastillo, A., Castillo, D., Roldan, A., Toledo-Gonz\u00e1lez, C., and Yanci, J. (2021). Is impaired coordination related to match physical load in footballers with cerebral palsy of different sport classes?. J. Sports Sci.","DOI":"10.1080\/02640414.2021.1880740"},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Papageorgiou, E., Simon-Martinez, C., Molenaers, G., Ortibus, E., Van Campenhout, A., and Desloovere, K. (2019). Are spasticity, weakness, selectivity, and passive range of motion related to gait deviations in children with spastic cerebral palsy? A statistical parametric mapping study. PLoS ONE, 14.","DOI":"10.1371\/journal.pone.0223363"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"723","DOI":"10.1002\/mus.24441","article-title":"Skeletal muscle satellite cells: Mediators of muscle growth during development and implications for developmental disorders","volume":"50","author":"Dayanidhi","year":"2014","journal-title":"Muscle Nerve"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/j.pmr.2014.09.005","article-title":"Pathophysiology of muscle contractures in cerebral palsy","volume":"26","author":"Mathewson","year":"2015","journal-title":"Phys. Med. Rehabil. Clin. N. Am."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"322","DOI":"10.1016\/j.gaitpost.2011.10.003","article-title":"Gait asymmetries in children with cerebral palsy: Do they deteriorate with running?","volume":"35","year":"2012","journal-title":"Gait Posture"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1080\/J006v25n03_05","article-title":"Range of motion in children with spastic diplegia, GMFCS I\u2013II compared to age and gender matched controls","volume":"25","author":"Kilgour","year":"2005","journal-title":"Phys. Occup. Ther. Pediatr."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"944","DOI":"10.1016\/j.clinbiomech.2010.06.011","article-title":"Ankle range of motion is key to gait efficiency in adolescents with cerebral palsy","volume":"25","author":"Ballaz","year":"2010","journal-title":"Clin. Biomech."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"2216","DOI":"10.1249\/MSS.0000000000000643","article-title":"How much do range of movement and coordination affect Paralympic sprint performance?","volume":"47","author":"Connick","year":"2015","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"208","DOI":"10.26582\/k.52.2.6","article-title":"The relationship among repeated sprint and change of direction abilities in football players with cerebral palsy","volume":"52","author":"Kokaly","year":"2020","journal-title":"Kinesiology"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"465","DOI":"10.1016\/j.gaitpost.2008.11.007","article-title":"The dynamic balance of the children with cerebral palsy and typical developing during gait. Part I: Spatial relationship between COM and COP trajectories","volume":"29","author":"Hsue","year":"2009","journal-title":"Gait Posture"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1093\/ptj\/pzy132","article-title":"Developmental trajectories for the early clinical assessment of balance by gross motor function classification system level for children with cerebral palsy","volume":"99","author":"McCoy","year":"2019","journal-title":"Phys. Ther."},{"key":"ref_58","first-page":"633","article-title":"Prevalence and characteristics of children with cerebral palsy in Europe","volume":"44","author":"Johnson","year":"2007","journal-title":"Dev. Med. Child Neurol."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"303","DOI":"10.1590\/1809-2950\/17022025032018","article-title":"Bipedal and unipedal stance in Brazilian football 7-a-side athletes with cerebral palsy","volume":"25","author":"Lopes","year":"2018","journal-title":"Fisioter. Pesqui."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3389\/fpsyg.2016.01731","article-title":"The level of vision necessary for competitive performance in rifle shooting: Setting the standards for Paralympic shooting with vision impairment","volume":"7","author":"Allen","year":"2016","journal-title":"Front. Psychol."},{"key":"ref_61","unstructured":"Hox, J. (2010). Multilevel Analysis: Techniques and Applications, Routledge. [2nd ed.]."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"295","DOI":"10.1007\/s10648-014-9287-x","article-title":"The effect of small sample size on two-level model estimates: A review and illustration","volume":"28","author":"McNeish","year":"2016","journal-title":"Educ. Psychol. Rev."}],"container-title":["International Journal of Environmental Research and Public Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1660-4601\/18\/8\/4320\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:49:53Z","timestamp":1760161793000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1660-4601\/18\/8\/4320"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,4,19]]},"references-count":62,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2021,4]]}},"alternative-id":["ijerph18084320"],"URL":"https:\/\/doi.org\/10.3390\/ijerph18084320","relation":{},"ISSN":["1660-4601"],"issn-type":[{"value":"1660-4601","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,4,19]]}}}