{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,7]],"date-time":"2026-07-07T13:54:34Z","timestamp":1783432474851,"version":"3.54.6"},"reference-count":45,"publisher":"SAGE Publications","license":[{"start":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T00:00:00Z","timestamp":1774396800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"name":"Office of the Assistant Secretary of Defense for Health Affairs through the Congressionally Directed Medical Research Programs\u2019 Spinal Cord Injury Research Program","award":["Expanding Knowledge and Information Delivery Aroun"],"award-info":[{"award-number":["Expanding Knowledge and Information Delivery Aroun"]}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Journal of Neurotrauma"],"abstract":"<jats:p>\n                    It is common for researchers in spinal cord injury (SCI) to treat limbs from the same individual as independent to increase sample size in limb-based analyses. However, this approach may violate independence assumptions required for traditional statistical tests. This study investigated the dependence of bilateral upper-limb motor and neurophysiological outcomes through a retrospective analysis of participants from the European Multicenter Study about Spinal Cord Injury. Data from 118 participants with acute cervical SCI (236 limbs) were analyzed, including ulnar compound muscle action potentials (CMAPs) recorded in the abductor digiti minimi and manual muscle scores for the flexor digitorum profundus, bilaterally assessed at 12 and 48 weeks postinjury. Our analysis stratified participants by injury severity into two groups: motor complete (\n                    <jats:italic toggle=\"yes\">n<\/jats:italic>\n                    = 55) and motor incomplete (\n                    <jats:italic toggle=\"yes\">n<\/jats:italic>\n                    = 63). Interlimb dependence was assessed using Spearman\u2019s rank correlations. To illustrate the implications of such dependence for inference, bootstrap analyses of motor recovery (12 vs. 48-week CMAPs) compared three analytical approaches using a linear mixed-effects model framework: randomly selecting outcomes from one limb per participant, including both limbs but ignoring intraparticipant correlation, and including both limbs but accounting for intraparticipant correlation. Bootstrap resampling was performed across sample sizes ranging from\n                    <jats:italic toggle=\"yes\">n<\/jats:italic>\n                    = 10 to 50. Moderate-to-strong correlations (Spearman\u2019s rho = 0.44\u20130.91) were observed between bilateral CMAPs and bilateral strength scores in both groups at 12 and 48 weeks postinjury. All models yielded similar CMAP recovery estimates (\u223c1.6 to 1.8 mV), but the precision of these estimates and the empirical power, reflecting the probability of detecting a significant recovery effect given the observed effect size and variability, varied across methods. Treating limbs as independent overestimated precision, resulting in the highest power estimates, whereas including only one limb reduced statistical power, particularly at lower sample sizes. Accounting for intraparticipant dependence yielded intermediate estimates of precision and power. These findings demonstrate that bilateral upper-limb outcomes in SCI are statistically dependent and highlight the need for statistical procedures that account for intraparticipant correlation in SCI research to ensure valid study conclusions.\n                  <\/jats:p>","DOI":"10.1177\/08977151261434451","type":"journal-article","created":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T05:40:46Z","timestamp":1774503646000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Intraindividual Limb Comparisons of Motor and Neurophysiological Outcomes Using the European Multicenter Study About Spinal Cord Injury: Implications for Clinical Trials in Acute Cervical Spinal Cord Injury"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9268-2456","authenticated-orcid":false,"given":"Kyle J.","family":"Missen","sequence":"first","affiliation":[{"name":"International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, British Columbia, Canada."},{"name":"Division of Physical Medicine and Rehabilitation, University of British Columbia, Vancouver, British Columbia, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacquelyn J.","family":"Cragg","sequence":"additional","affiliation":[{"name":"Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4717-5305","authenticated-orcid":false,"given":"Jana","family":"Dengler","sequence":"additional","affiliation":[{"name":"Division of Plastic, Reconstructive &amp; Aesthetic Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada."},{"name":"Division of Plastic &amp; Reconstructive Surgery, Tory Trauma Program, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ida K.","family":"Fox","sequence":"additional","affiliation":[{"name":"Department of Surgery, Washington University, St. Louis, Missouri, USA."},{"name":"Veterans Affairs St. Louis Healthcare System, St. Louis, Missouri, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Armin","family":"Curt","sequence":"additional","affiliation":[{"name":"Spinal Cord Injury Center Balgrist, University of Z\u00fcrich, Z\u00fcrich, Switzerland."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Schubert","sequence":"additional","affiliation":[{"name":"Spinal Cord Injury Center Balgrist, University of Z\u00fcrich, Z\u00fcrich, Switzerland."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Norbert","family":"Weidner","sequence":"additional","affiliation":[{"name":"Spinal Cord Injury Center, Heidelberg University Hospital, Heidelberg, Germany."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael J.","family":"Berger","sequence":"additional","affiliation":[{"name":"International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, British Columbia, Canada."},{"name":"Division of Physical Medicine and Rehabilitation, University of British Columbia, Vancouver, British Columbia, 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