Cited by 239Stroke Rehabilitation and RecoveryVirtual Reality Applications and ImpactsTranscranial Magnetic Stimulation Studies

Effect of Specific Over Nonspecific VR-Based Rehabilitation on Poststroke Motor Recovery: A Systematic Meta-analysis

Open access
Maier, Martina, Rubio Ballester, Belén, Duff, Armin, Duarte Oller, Esther, Verschure, Paul F. M. J.·2019·Neurorehabilitation and Neural Repair

Abstract

Background. Despite the rise of virtual reality (VR)-based interventions in stroke rehabilitation over the past decade, no consensus has been reached on its efficacy. This ostensibly puzzling outcome might not be that surprising given that VR is intrinsically neutral to its use—that is, an intervention is effective because of its ability to mobilize recovery mechanisms, not its technology. As VR systems specifically built for rehabilitation might capitalize better on the advantages of technology to implement neuroscientifically grounded protocols, they might be more effective than those designed for recreational gaming. Objective. We evaluate the efficacy of specific VR (SVR) and nonspecific VR (NSVR) systems for rehabilitating upper-limb function and activity after stroke. Methods. We conducted a systematic search for randomized controlled trials with adult stroke patients to analyze the effect of SVR or NSVR systems versus conventional therapy (CT). Results. We identified 30 studies including 1473 patients. SVR showed a significant impact on body function (standardized mean difference [SMD] = 0.23; 95% CI = 0.10 to 0.36; P = .0007) versus CT, whereas NSVR did not (SMD = 0.16; 95% CI = −0.14 to 0.47; P = .30). This result was replicated in activity measures. Conclusions. Our results suggest that SVR systems are more beneficial than CT for upper-limb recovery, whereas NSVR systems are not. Additionally, we identified 6 principles of neurorehabilitation that are shared across SVR systems and are possibly responsible for their positive effect. These findings may disambiguate the contradictory results found in the current literature.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1177/1545968318820169

Cites

7 of 7 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Several systematic reviews have evaluated the effect of new home-technologies on patient clinical outcomes, but positive results were not always guaranteed.

    “Although several systematic reviews have evaluated the effect of new home-technologies on patient clinical outcomes, positive results were not always guaranteed [6,7,8].”

    From High-Tech Home-Based Rehabilitation after Stroke: A Systematic Review and Meta-Analysis (2023) · cites this paper as [7]

    The Introduction reports that several meta-analyses evaluated VR technologies for stroke rehabilitation and that some found no benefit over conventional therapy. It describes home rehabilitation as a potential use of these technologies, but does not establish that this meta-analysis evaluated technologies used at home. The home-technologies qualifier is therefore not supported. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 67

  1. [2]Piron L Turolla A Agostini M et al Exercises for paretic upper limb after stroke: a combined virtual-reality and telemedicine approach. J Rehabil Med. 2009; 41: 1016- 1020. doi: 10.2340/16501977-0459 19841835 · DOI
  2. [3]Proffitt R Lange B. Considerations in the efficacy and effectiveness of virtual reality interventions for stroke rehabilitation: moving the field forward. Phys Ther. 2015; 95: 441- 448. doi: 10.2522/ptj.20130571 25343960 PMC4348718 · DOI
  3. [4]Crosbie JH Lennon S Basford JR Mcdonough SM. Virtual reality in stroke rehabilitation: still more virtual than real. Disabil Rehabil. 2007; 29: 1139- 1146. doi: 10.1080/09638280600960909 17613000 · DOI
  4. [5]Saposnik G Levin M; Outcome Research Canada (SORCan) Working Group. Virtual reality in stroke rehabilitation: a meta-analysis and implications for clinicians. Stroke. 2011; 42: 1380- 1386. doi: 10.1161/STROKEAHA.110.605451 21474804 · DOI
  5. [6]Lohse KR Hilderman CGE Cheung KL Tatla S Van Der Loos HFM Virtual reality therapy for adults post-stroke: a systematic review and meta-analysis exploring virtual environments and commercial games in therapy. PLoS One. 2014; 9(3): e93318. doi: 10.1371/journal.pone.0093318 24681826 PMC3969329 · DOI · Paper page
  6. [7]Saywell N Taylor N Rodgers E Skinner L Boocock M. Play-based interventions improve physical function for people with adult-acquired brain injury: a systematic review and meta-analysis of randomised controlled trials. Clin Rehabil. 2017; 31: 145- 157. doi: 10.1177/0269215516631384 26869595 · DOI
  7. [8]Saposnik G Cohen LG Mamdani M et al; Stroke Outcomes Research Canada Efficacy and safety of non-immersive virtual reality exercising in stroke rehabilitation (EVREST): a randomised, multicentre, single-blind, controlled trial. Lancet Neurol. 2016; 15: 1019- 1027. doi: 10.1016/S1474-4422(16)30121-1 27365261 PMC5108052 · DOI
  8. [10]Shrier I Platt RW Steele RJ. Mega-trials vs meta-analysis: precision vs heterogeneity? Contemp Clin Trials. 2007; 28: 324- 328. doi: 10.1016/j.cct.2006.11.007 17188025 · DOI
  9. [11]de Rooij IJM van de Port IGL Meijer JWG. Effect of virtual reality training on balance and gait ability in patients with stroke: systematic review and meta-analysis. Phys Ther. 2016; 96: 1905- 1918. doi: 10.2522/ptj.20160054 27174255 · DOI
  10. [12]Jack D Boian R Merians AS et al Virtual reality-enhanced stroke rehabilitation. IEEE Trans Neural Syst Rehabil Eng. 2001; 9: 308- 318. doi: 10.1109/7333.948460 11561668 · DOI
  11. [13]Kizony R Katz N Weiss PL. Adapting an immersive virtual reality system for rehabilitation. J Vis Comput Animat. 2003; 14: 261- 268. doi: 10.1002/vis.323 · DOI
  12. [14]Zondervan DK Friedman N Chang E et al Home-based hand rehabilitation after chronic stroke: randomized, controlled single-blind trial comparing the MusicGlove with a conventional exercise program. J Rehabil Res Dev. 2016; 53: 457- 472. 27532880
  13. [15]Levin MF Snir O Liebermann DG Weingarden H Weiss PL. Virtual reality versus conventional treatment of reaching ability in chronic stroke: clinical feasibility study. Neurol Ther. 2012; 1: 3. doi: 10.1007/s40120-012-0003-9 26000209 PMC4389038 · DOI
  14. [16]Hanlon RE. Motor learning following unilateral stroke. Arch Phys Med Rehabil. 1996; 77: 811- 815. doi: 10.1016/S0003-9993(96)90262-2 8702377 · DOI
  15. [17]Dobkin BH. Strategies for stroke rehabilitation. Lancet Neurol. 2004; 3: 528- 536. doi: 10.1016/S1474-4422(04)00851-8 15324721 PMC4164204 · DOI
  16. [18]Cirstea MC Levin MF. Improvement of arm movement patterns and endpoint control depends on type of feedback during practice in stroke survivors. Neurorehabil Neural Repair. 2007; 21: 398- 411. doi: 10.1177/1545968306298414 17369514 · DOI
  17. [19]Kleim JA Jones TA. Principles of experience-dependent neural plasticity: implications for rehabilitation after brain damage. J Speech Lang Hear Res. 2008; 51: S225- S239. doi: 10.1044/1092-4388(2008/018) 18230848 · DOI
  18. [21]Christ O Reiner M. Perspectives and possible applications of the rubber hand and virtual hand illusion in non-invasive rehabilitation: technological improvements and their consequences. Neurosci Biobehav Rev. 2014; 44: 33- 44. doi: 10.1016/j.neubiorev.2014.02.013 24661983 · DOI
  19. [22]Kwakkel G Veerbeek JM van Wegen EEH Wolf SL. Constraint-induced movement therapy after stroke. Lancet Neurol. 2015; 14: 224- 234. doi: 10.1016/S1474-4422(14)70160-7 25772900 PMC4361809 · DOI
  20. [23]Levin MF Weiss PL Keshner EA. Emergence of virtual reality as a tool for upper limb rehabilitation: incorporation of motor control and motor learning principles. Phys Ther. 2015; 95: 415- 425. doi: 10.2522/ptj.20130579 25212522 PMC4348716 · DOI
  21. [24]Thomas LH French B Coupe J et al Repetitive task training for improving functional ability after stroke. Stroke. 2017; 48: 102- 104. doi: 10.1161/STROKEAHA.117.016503 · DOI
  22. [28]Moher D Liberati A Tetzlaff J, Altman DG; PRISMA Group Preferred reporting items for systematic reviews and meta-analyses: the PRISMA Statement. PLoS Med. 2009; 6: e1000097. doi: 10.1371/journal.pmed.1000097 19621072 PMC2707599 · DOI · Paper page
  23. [29]Lombard M Ditton T. At the heart of it all: the concept of presence. J Comput Mediat Commun. 2006; 3(2): JCMC321. doi: 10.1111/j.1083-6101.1997.tb00072.x · DOI
  24. [31]Zeiler SR Hubbard RB Gibson EM et al Paradoxical motor recovery from a first stroke by re-opening a sensitive period with a second stroke: reopening a postischemic sensitive period. Neurorehabil Neural Repair. 2015; 46(suppl 1): ATP86. doi: 10.1177/1545968315624783 PMC4930432 26721868 · DOI · Paper page
  25. [32]Duncan PW. Outcome measures in stroke rehabilitation. Handb Clin Neurol. 2013; 110: 105- 111. 23312634
  26. [33]Fugl-Meyer AR Jääskö L Leyman I Olsson S Steglind S. The post-stroke hemiplegic patient: 1. A method for evaluation of physical performance. Scand J Rehabil Med. 1975; 7: 13- 31. 1135616
  27. [34]Collin C Wade D. Assessing motor impairment after stroke: a pilot reliability study. J Neurol Neurosurg Psychiatry. 1990; 53: 576- 579. doi: 10.1136/JNNP.53.7.576 2391521 PMC488133 · DOI
  28. [35]Brunnstrom S. Motor testing procedures in hemiplegia: based on sequential recovery stages. Phys Ther. 1966; 46: 357- 375. doi: 10.1093/ptj/46.4.357 5907254 · DOI
  29. [36]Duncan PW Wallace D Lai SM Johnson D Embretson S Laster LJ. The stroke impact scale version 2.0: evaluation of reliability, validity, and sensitivity to change. Stroke. 1999; 30: 2131- 2140. doi: 10.1161/01.STR.30.10.2131 10512918 · DOI
  30. [37]Mahoney FI Barthel DW. Functional evaluation: the Barthel Index. Md State Med J. 1965; 14: 61- 65. 14258950
  31. [38]Keith RA Granger CV Hamilton BB Sherwin FS. The functional independence measure: a new tool for rehabilitation. Adv Clin Rehabil. 1987; 1: 6- 18. 3503663
  32. [39]Carroll D. A Quantitative test of upper extremity function. J Chronic Dis. 1965; 18: 479- 491. doi: 10.1016/0021-9681(65)90030-5 14293031 · DOI
  33. [40]Mathiowetz V Volland G Kashman N Weber K. Adult norms for the Box and Block Test of Manual Dexterity. Am J Occup Ther. 1985; 39: 386- 391. doi: 10.5014/ajot.39.6.386 3160243 · DOI
  34. [41]Wolf SL Catlin PA Ellis M Archer AL Morgan B Piacentino A. Assessing Wolf Motor Function Test as outcome measure for research in patients after stroke. Stroke. 2001; 32: 1635- 1639. doi: 10.1161/01.STR.32.7.1635 11441212 · DOI
  35. [42]Duff M Chen Y Cheng L et al Adaptive mixed reality rehabilitation improves quality of reaching movements more than traditional reaching therapy following stroke. Neurorehabil Neural Repair. 2012; 27: 306- 315. doi: 10.1177/1545968312465195 23213076 · DOI
  36. [43]da Silva Ribeiro NM Ferraz DD Pedreira É et al Virtual rehabilitation via Nintendo Wii® and conventional physical therapy effectively treat post-stroke hemiparetic patients. Top Stroke Rehabil. 2015; 22: 299- 305. doi: 10.1179/1074935714Z.0000000017 26258455 · DOI
  37. [44]Saposnik G Teasell R Mamdani M et al; Stroke Outcome Research Canada (SORCan) Working Group. Effectiveness of virtual reality using wii gaming technology in stroke rehabilitation: a pilot randomized clinical trial and proof of principle. Stroke. 2010; 41: 1477- 1484. doi: 10.1161/STROKEAHA.110.584979 20508185 PMC4879973 · DOI
  38. [45]Ware JE Jr Sherbourne CD The MOS 36-item short-form health survey (SF-36): I. Conceptual framework and item selection. Med Care. 1992; 30: 473- 483. 1593914
  39. [46]Yin CW Sien NY Ying LA Chung FM Leng DTM Virtual reality for upper extremity rehabilitation in early stroke: a pilot randomized controlled trial. Clin Rehabil. 2014; 28: 1107- 1114. doi: 10.1177/0269215514532851 24803644 · DOI
  40. [47]Zucconi C Valt V Agostini M Turolla A Tonin P Piron L. Assessment of a virtual teacher feedback for the recovery of the upper limb after stroke. Ital J Physiother. 2011; 1: 101- 106. doi: 10.1177/1545968312447071 · DOI
  41. [48]Standen PJ Threapleton K Richardson A et al A low cost virtual reality system for home based rehabilitation of the arm following stroke: a randomised controlled feasibility trial. Clin Rehabil. 2016; 31: 340- 350. doi: 10.1177/0269215516640320 27029939 PMC5349317 · DOI
  42. [49]Aşkın A Atar E Koçyiğit H Tosun A. Effects of Kinect-based virtual reality game training on upper extremity motor recovery in chronic stroke. Somatosens Mot Res. 2018; 35: 25- 32. doi: 10.1080/08990220.2018.1444599 29529919 · DOI
  43. [52]Yamazaki T Nagao S Lennon W Tanaka S. Modeling memory consolidation during posttraining periods in cerebellovestibular learning. Proc Natl Acad Sci U S A. 2015; 112: 3541- 3546. doi: 10.1073/pnas.1413798112 25737547 PMC4371920 · DOI
  44. [53]Higgins JPT Thompson SG. Quantifying heterogeneity in a meta-analysis. Stat Med. 2002; 21: 1539- 1558. doi: 10.1002/sim.1186 12111919 · DOI · Paper page
  45. [54]Turolla A Dam M Ventura L et al Virtual reality for the rehabilitation of the upper limb motor function after stroke: a prospective controlled trial. J Neuroeng Rehabil. 2013; 10: 85. doi: 10.1186/1743-0003-10-85 23914733 PMC3734026 · DOI
  46. [55]da Silva Cameirão M I Badia SB Duarte E Verschure PFMJ. Virtual reality based rehabilitation speeds up functional recovery of the upper extremities after stroke: a randomized controlled pilot study in the acute phase of stroke using the Rehabilitation Gaming System. Restor Neurol Neurosci. 2011; 29: 287- 298. doi: 10.3233/RNN-2011-0599 21697589 · DOI
  47. [56]Crosbie JH Lennon S McGoldrick MC McNeill MD McDonough SM. Virtual reality in the rehabilitation of the arm after hemiplegic stroke: a randomized controlled pilot study. Clin Rehabil. 2012; 26: 798- 806. doi: 10.1177/0269215511434575 22275463 · DOI
  48. [57]Jang SH You SH Hallett M et al Cortical reorganization and associated functional motor recovery after virtual reality in patients with chronic stroke: an experimenter-blind preliminary study. Arch Phys Med Rehabil. 2005; 86: 2218- 2223. doi: 10.1016/j.apmr.2005.04.015 16271575 · DOI
  49. [58]Jo K Jung J Yu J. Effects of virtual reality-based rehabilitation on upper extremity function and visual perception in stroke patients: a randomized control trial. J Phys Ther Sci. 2012; 24: 1205- 1208. doi: 10.1589/jpts.24.1205 · DOI
  50. [59]Kiper P Piron L Turolla A Stozek J Tonin P. The effectiveness of reinforced feedback in virtual environment in the first 12 months after stroke. Neurol Neurochir Pol. 2011; 45: 436- 444. doi: 10.1016/S0028-3843(14)60311-X 22127938 · DOI
  51. [60]Kiper P Agostini M Luque-Moreno C Tonin P Turolla A. Reinforced feedback in virtual environment for rehabilitation of upper extremity dysfunction after stroke: preliminary data from a randomized controlled trial. Biomed Res Int. 2014; 2014: 752128. doi: 10.1155/2014/752128 24745024 PMC3972918 · DOI
  52. [61]Kwon JS Park MJ Yoon IJ Park SH. Effects of virtual reality on upper extremity function and activities of daily living performance in acute stroke: a double-blind randomized clinical trial. NeuroRehabilitation. 2012; 31: 379- 385. doi: 10.3233/NRE-2012-00807 23232161 · DOI
  53. [62]Lee S Kim Y Lee BH. Effect of virtual reality-based bilateral upper extremity training on upper extremity function after stroke: a randomized controlled clinical trial. Occup Ther Int. 2016; 23: 357- 368. doi: 10.1002/oti.1437 27419927 · DOI
  54. [63]Piron L Turolla A Agostini M et al Motor learning principles for rehabilitation: a pilot randomized controlled study in poststroke patients. Neurorehabil Neural Repair. 2010; 24: 501- 508. doi: 10.1177/1545968310362672 20581337 · DOI
  55. [64]Shin JH Ryu H Jang S. A task-specific interactive game-based virtual reality rehabilitation system for patients with stroke: a usability test and two clinical experiments. J Neuroeng Rehabil. 2014; 11: 32. doi: 10.1186/1743-0003-11-32 24597650 PMC3975728 · DOI
  56. [65]Kiper P Szczudlik A Agostini M et al Virtual reality for upper limb rehabilitation in subacute and chronic stroke: a randomized controlled trial. Arch Phys Med Rehabil. 2018; 99: 834- 842.e4. doi: 10.1016/j.apmr.2018.01.023 29453980 · DOI
  57. [66]Kottink AIR Prange GB Krabben T Rietman JS Buurke JH Gaming and conventional exercises for improvement of arm function after stroke: a randomized controlled pilot study. Games Health J. 2014; 3: 184- 191. doi: 10.1089/g4h.2014.0026 26196178 · DOI
  58. [67]Brunner I Skouen JS Hofstad H et al Virtual reality training for upper extremity in subacute stroke (VIRTUES): a multicenter RCT. Neurology. 2017; 89: 2413- 2421. doi: 10.1212/WNL.0000000000004744 29142090 · DOI
  59. [68]Kong KH Loh YJ Thia E et al Efficacy of a virtual reality commercial gaming device in upper limb recovery after stroke: a randomized, controlled study. Top Stroke Rehabil. 2016; 23: 333- 340. doi: 10.1080/10749357.2016.1139796 27098818 · DOI
  60. [69]Rand D Weingarden H Weiss R et al Self-training to improve UE function at the chronic stage post-stroke: a pilot randomized controlled trial. Disabil Rehabil. 2017; 39: 1541- 1548. doi: 10.1080/09638288.2016.1239766 27793071 · DOI
  61. [70]Sin H Lee G. Additional virtual reality training using Xbox Kinect in stroke survivors with hemiplegia. Am J Phys Med Rehabil. 2013; 92: 871- 880. doi: 10.1097/PHM.0b013e3182a38e40 24051993 · DOI
  62. [71]Türkbey T Kutlay S Gök H. Clinical feasibility of Xbox Kinect™ training for stroke rehabilitation: a single-blind randomized controlled pilot study. J Rehabil Med. 2017; 49: 22- 29. doi: 10.2340/16501977-2183 27973678 · DOI
  63. [72]Yavuzer G Senel A Atay MB Stam HJ. “Playstation eyetoy games” improve upper extremity-related motor functioning in subacute stroke: a randomized controlled clincial trial. Eur J Phys Rehabil Med. 2008; 44: 237- 244. 18469735
  64. [73]Krakauer JW. Motor learning: its relevance to stroke recovery and neurorehabilitation. Curr Opin Neurol. 2006; 19: 84- 90. 16415682
  65. [74]Nirme J Duff A Verschure PFMJ Adaptive rehabilitation gaming system: on-line individualization of stroke rehabilitation. Conf Proc IEEE Eng Med Biol Soc. 2011; 2011: 6749- 6752. doi: 10.1109/IEMBS.2011.6091665 22255888 · DOI
  66. [75]Arya KN Verma R Garg RK. Estimating the minimal clinically important difference of an upper extremity recovery measure in subacute stroke patients. Top Stroke Rehabil. 2011; 18(suppl 1): 599- 610. doi: 10.1310/tsr18s01-599 22120029 · DOI
  67. [76]Page SJ Fulk GD Boyne P. Clinically important differences for the upper-extremity Fugl-Meyer scale in people with minimal to moderate impairment due to chronic stroke. Phys Ther. 2012; 92: 791- 798. doi: 10.2522/ptj.20110009 22282773 · DOI

Cited by

Sorted by citations

Authors
Maier, M., Rubio Ballester, B., Duff, A., Duarte Oller, E., & Verschure, P. F. M. J.
Affiliations
  • Barcelona Institute of Science and Technology (ES)
  • Laboratory of Synthetic, Perceptive, Emotive and Cognitive Systems (SPECS), Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona, Spain
  • Rehabilitation Research Group, Institut Hospital del Mar d’Investigacions Mèdiques (IMIM), Physical Medicine and Rehabilitation Department Parc de Salut Mar (Hospital del Mar, Hospital de l’Esperança), Barcelona, Spain
  • Institució Catalana de Recerca i Estudis Avançats (ES)
Corresponding author
Verschure, Paul F. M. J.
Venue
Neurorehabilitation and Neural Repair
Published
2019-01-30
Volume
33
Issue
2
Pages
112-129
ISSN
  • 0888-4390 (ISSN-L)
  • 1545-9683
  • 1552-6844
OpenAlex
W2914871332
Cited by
239
References
7
Citations by year
2026: 28 · 2025: 24 · 2024: 40 · 2023: 29 · 2022: 34 · 2021: 54 · 2020: 23 · 2019: 7
FWCI
20.60
Type
journal article
Language
en
Open access
Locations
  • Neurorehabilitation and neural repair (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Dipòsit Digital de la Universitat de Barcelona (Universitat de Barcelona) (publishedVersion, cc-by-nc)
  • RECERCAT (Consorci de Serveis Universitaris de Catalunya) (submittedVersion, cc-by-nc)
  • Repositori digital de la UPF (Universitat Pompeu Fabra) (submittedVersion)
Funders
  • SANAR (MINECO, TIN2013- 44200)
  • cDAC (ERC 2013 ADG 341196)
  • socSMCs (EC, H2020-641321)
Topics
  • Health Sciences › Medicine › Rehabilitation › Stroke Rehabilitation and Recovery
  • Physical Sciences › Computer Science › Human-Computer Interaction › Virtual Reality Applications and Impacts
  • Life Sciences › Neuroscience › Neurology › Transcranial Magnetic Stimulation Studies
Keywords
virtual reality, stroke rehabilitation, upper limb function, conventional therapy, physiological function
MeSH terms
Telerehabilitation, Stroke Rehabilitation, Humans, Motor Activity, Randomized Controlled Trials as Topic, Recovery of Function, Upper Extremity, Observational Studies as Topic

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review