{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T11:46:50Z","timestamp":1785498410199,"version":"3.56.0"},"reference-count":51,"publisher":"Oxford University Press (OUP)","issue":"3","license":[{"start":{"date-parts":[[2020,12,25]],"date-time":"2020-12-25T00:00:00Z","timestamp":1608854400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["NIH R21 AG044710"],"award-info":[{"award-number":["NIH R21 AG044710"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Foundation for Physical Therapy and The Academy of Geriatric Physical Therapy"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,3,18]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Objective<\/jats:title>\n                  <jats:p>To identify clinical phenotypes of knee osteoarthritis (OA) using measures from the following domains: 1) multimorbidity; 2) psychological distress; 3) pain sensitivity; and 4) knee impairment or pathology.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Design<\/jats:title>\n                  <jats:p>Data were collected from 152 people with knee OA and from 31 pain-free individuals. In participants with knee OA, latent profile analysis (LPA) was applied to the following measures: normalized knee extensor strength, Functional Comorbidity Index (FCI), Pain Catastrophizing Scale (PCS), and local (knee) pressure pain threshold. Comparisons were performed between empirically derived phenotypes from the LPA and healthy older adults on these measures. Comparisons were also made between pheonotypes on pain intensity, functional measures, use of health care, and history of knee injury.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>LPA resulted in a four-group solution. Compared with all other groups, group 1 (9% of the study population) had higher FCI scores. Group 2 (63%) had elevated pain sensitivity and quadriceps weakness relative to group 4 and healthy older adults. Group 3 (11%) had higher PCS scores than all other groups. Group 4 (17%) had greater leg strength, except relative to healthy older adults, and reduced pain sensitivity relative to all groups. Groups 1 and 3 demonstrated higher pain and worse function than other groups, and group 4 had higher rates of knee injury.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>Four phenotypes of knee OA were identified using psychological factors, comorbidity status, pain sensitivity, and leg strength. Follow-up analyses supported the replicability of this phenotype structure, but future research is needed to determine its usefulness in knee OA care.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/pm\/pnaa398","type":"journal-article","created":{"date-parts":[[2020,12,10]],"date-time":"2020-12-10T04:16:29Z","timestamp":1607573789000},"page":"653-662","source":"Crossref","is-referenced-by-count":22,"title":["Determination of Pain Phenotypes in Knee Osteoarthritis Using Latent Profile Analysis"],"prefix":"10.1093","volume":"22","author":[{"given":"Andrew J","family":"Kittelson","sequence":"first","affiliation":[{"name":"School of Physical Therapy and Rehabilitation Science, University of Montana, Missoula, Montana, USA"},{"name":"Physical Therapy Program, Department of Physical Medicine and Rehabilitation, University of Colorado, Aurora, Colorado, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah J","family":"Schmiege","sequence":"additional","affiliation":[{"name":"Department of Biostatistics & Informatics, Colorado School of Public Health, University of Colorado, Aurora, Colorado, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katrina","family":"Maluf","sequence":"additional","affiliation":[{"name":"Physical Therapy Program, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven Z","family":"George","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery and Duke Clinical Research Institute, Duke University, Durham, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer E","family":"Stevens-Lapsley","sequence":"additional","affiliation":[{"name":"Physical Therapy Program, Department of Physical Medicine and Rehabilitation, University of Colorado, Aurora, Colorado, USA"},{"name":"Veterans Affairs Medical Center, Geriatric Research, Education and Clinical Center, Denver, Colorado, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2020,12,25]]},"reference":[{"issue":"2","key":"2021031817243132400_pnaa398-B1","doi-asserted-by":"crossref","first-page":"429","DOI":"10.1002\/art.33344","article-title":"Prevalence of magnetic resonance imaging-defined atrophic and hypertrophic phenotypes of knee osteoarthritis in a population-based cohort","volume":"64","author":"Roemer","year":"2012","journal-title":"Arthritis Rheum"},{"issue":"9","key":"2021031817243132400_pnaa398-B2","doi-asserted-by":"crossref","first-page":"2354","DOI":"10.1002\/art.39224","article-title":"Clinical phenotype classifications based on static varus alignment and varus thrust in Japanese patients with medial knee osteoarthritis","volume":"67","author":"Iijima","year":"2015","journal-title":"Arthritis Rheumatol"},{"issue":"4","key":"2021031817243132400_pnaa398-B3","doi-asserted-by":"crossref","first-page":"544","DOI":"10.1016\/j.joca.2015.01.006","article-title":"Clinical phenotypes in patients with knee osteoarthritis: A study in the Amsterdam osteoarthritis cohort","volume":"23","author":"van der Esch","year":"2015","journal-title":"Osteoarthritis Cartilage"},{"issue":"11","key":"2021031817243132400_pnaa398-B4","doi-asserted-by":"crossref","first-page":"1535","DOI":"10.1002\/acr.20571","article-title":"Identification of phenotypes with different clinical outcomes in knee osteoarthritis: Data from the Osteoarthritis Initiative","volume":"63","author":"Knoop","year":"2011","journal-title":"Arthritis Care Res (Hoboken)"},{"issue":"6","key":"2021031817243132400_pnaa398-B5","doi-asserted-by":"crossref","first-page":"1697","DOI":"10.1002\/art.34453","article-title":"Osteoarthritis: A disease of the joint as an organ","volume":"64","author":"Loeser","year":"2012","journal-title":"Arthritis Rheum"},{"issue":"5","key":"2021031817243132400_pnaa398-B6","doi-asserted-by":"crossref","first-page":"443","DOI":"10.1093\/fampra\/cmm036","article-title":"Knee pain and osteoarthritis in the general population: What influences patients to consult?","volume":"24","author":"Bedson","year":"2007","journal-title":"Fam Pract"},{"issue":"1","key":"2021031817243132400_pnaa398-B7","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1186\/1471-2296-14-195","article-title":"What influences patients with Osteoarthritis to consult their GP about their symptoms? A narrative review","volume":"14","author":"Paskins","year":"2013","journal-title":"BMC Fam Pract"},{"issue":"8","key":"2021031817243132400_pnaa398-B8","doi-asserted-by":"crossref","first-page":"1039","DOI":"10.1002\/art.1780290816","article-title":"Development of criteria for the classification and reporting of osteoarthritis. Classification of osteoarthritis of the knee. Diagnostic and Therapeutic Criteria Committee of the American Rheumatism Association","volume":"29","author":"Altman","year":"1986","journal-title":"Arthritis Rheum"},{"issue":"3","key":"2021031817243132400_pnaa398-B9","doi-asserted-by":"crossref","first-page":"483","DOI":"10.1136\/ard.2009.113100","article-title":"EULAR evidence-based recommendations for the diagnosis of knee osteoarthritis","volume":"69","author":"Zhang","year":"2010","journal-title":"Ann Rheum Dis"},{"issue":"3","key":"2021031817243132400_pnaa398-B10","doi-asserted-by":"crossref","first-page":"422","DOI":"10.2522\/ptj.20130256","article-title":"Future directions in painful knee osteoarthritis: Harnessing complexity in a heterogeneous population","volume":"94","author":"Kittelson","year":"2014","journal-title":"Phys Ther"},{"issue":"5","key":"2021031817243132400_pnaa398-B11","doi-asserted-by":"crossref","first-page":"612","DOI":"10.1002\/acr.22734","article-title":"Determination of pain phenotypes in knee osteoarthritis: A latent class analysis using data from the Osteoarthritis Initiative","volume":"68","author":"Kittelson","year":"2016","journal-title":"Arthritis Care Res (Hoboken)"},{"issue":"5","key":"2021031817243132400_pnaa398-B12","doi-asserted-by":"crossref","first-page":"513","DOI":"10.1093\/geronb\/gbq049","article-title":"Frontiers in the use of biomarkers of health in research on stress and aging","volume":"65","author":"Piazza","year":"2010","journal-title":"J Gerontol B Psychol Sci Soc Sci"},{"issue":"2","key":"2021031817243132400_pnaa398-B13","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1016\/j.pain.2011.09.018","article-title":"Unpacking the burden: Understanding the relationships between chronic pain and comorbidity in the general population","volume":"153","author":"Dominick","year":"2012","journal-title":"Pain"},{"issue":"6","key":"2021031817243132400_pnaa398-B14","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1016\/j.jclinepi.2004.10.018","article-title":"The development of a comorbidity index with physical function as the outcome","volume":"58","author":"Groll","year":"2005","journal-title":"J Clin Epidemiol"},{"issue":"11","key":"2021031817243132400_pnaa398-B15","doi-asserted-by":"crossref","first-page":"1515","DOI":"10.1002\/lt.21172","article-title":"Modified Charlson comorbidity index for predicting survival after liver transplantation","volume":"13","author":"Volk","year":"2007","journal-title":"Liver Transpl"},{"issue":"3","key":"2021031817243132400_pnaa398-B16","doi-asserted-by":"crossref","first-page":"573","DOI":"10.1016\/j.pain.2010.04.003","article-title":"Sensitization in patients with painful knee osteoarthritis","volume":"149","author":"Arendt-Nielsen","year":"2010","journal-title":"Pain"},{"issue":"4","key":"2021031817243132400_pnaa398-B17","doi-asserted-by":"crossref","first-page":"376","DOI":"10.1016\/j.ejpain.2010.08.011","article-title":"Reference values of mechanical and thermal pain tests in a pain-free population","volume":"15","author":"Neziri","year":"2011","journal-title":"Eur J Pain"},{"issue":"2","key":"2021031817243132400_pnaa398-B18","first-page":"335","article-title":"The relationship between disease symptoms, life events, coping and treatment, and depression among older adults with osteoarthritis","volume":"35","author":"Sale","year":"2008","journal-title":"J Rheumatol"},{"issue":"11","key":"2021031817243132400_pnaa398-B19","doi-asserted-by":"crossref","first-page":"1866","DOI":"10.1016\/j.apmr.2009.06.012","article-title":"Relationships of fear, anxiety, and depression with physical function in patients with knee osteoarthritis","volume":"90","author":"Scopaz","year":"2009","journal-title":"Arch Phys Med Rehabil"},{"issue":"1","key":"2021031817243132400_pnaa398-B20","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/j.apmr.2005.08.110","article-title":"Determinants of self-report outcome measures in people with knee osteoarthritis","volume":"87","author":"Maly","year":"2006","journal-title":"Arch Phys Med Rehabil"},{"issue":"9","key":"2021031817243132400_pnaa398-B21","doi-asserted-by":"crossref","first-page":"1095","DOI":"10.1016\/j.joca.2011.06.003","article-title":"Psychological health impact on 2-year changes in pain and function in persons with knee pain: Data from the Osteoarthritis Initiative","volume":"19","author":"Riddle","year":"2011","journal-title":"Osteoarthritis Cartilage"},{"issue":"10","key":"2021031817243132400_pnaa398-B22","doi-asserted-by":"crossref","first-page":"588","DOI":"10.1136\/ard.57.10.588","article-title":"Quadriceps weakness in knee osteoarthritis: The effect on pain and disability","volume":"57","author":"O\u2019Reilly","year":"1998","journal-title":"Ann Rheum Dis"},{"issue":"8","key":"2021031817243132400_pnaa398-B23","first-page":"1785","article-title":"Determinants of pain severity in knee osteoarthritis: Effect of demographic and psychosocial variables using 3 pain measures","volume":"26","author":"Creamer","year":"1999","journal-title":"J Rheumatol"},{"issue":"1","key":"2021031817243132400_pnaa398-B24","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1007\/s10067-016-3495-3","article-title":"Depressive symptoms and structural disease progression in knee osteoarthritis: Data from the Osteoarthritis Initiative","volume":"36","author":"Rathbun","year":"2017","journal-title":"Clin Rheumatol"},{"issue":"5","key":"2021031817243132400_pnaa398-B25","doi-asserted-by":"crossref","first-page":"700","DOI":"10.2522\/ptj.20100330","article-title":"Impact of psychological factors in the experience of pain","volume":"91","author":"Linton","year":"2011","journal-title":"Phys Ther"},{"issue":"3","key":"2021031817243132400_pnaa398-B26","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1016\/S0304-3959(99)00242-0","article-title":"Fear-avoidance and its consequences in chronic musculoskeletal pain: A state of the art","volume":"85","author":"Vlaeyen","year":"2000","journal-title":"Pain"},{"issue":"2","key":"2021031817243132400_pnaa398-B27","doi-asserted-by":"crossref","first-page":"314","DOI":"10.1016\/j.pain.2010.10.034","article-title":"Role of pain catastrophizing during pain processing in a cohort of patients with chronic and severe arthritic knee pain","volume":"152","author":"Wade","year":"2011","journal-title":"Pain"},{"issue":"12","key":"2021031817243132400_pnaa398-B28","doi-asserted-by":"crossref","first-page":"2775","DOI":"10.1016\/j.pain.2013.08.012","article-title":"Prognostic value of coping strategies in a community-based sample of persons with chronic symptomatic knee osteoarthritis","volume":"154","author":"Alschuler","year":"2013","journal-title":"Pain"},{"issue":"5","key":"2021031817243132400_pnaa398-B29","doi-asserted-by":"crossref","first-page":"863","DOI":"10.1016\/j.jpainsymman.2008.05.009","article-title":"Pain catastrophizing and pain-related fear in osteoarthritis patients: Relationships to pain and disability","volume":"37","author":"Somers","year":"2009","journal-title":"J Pain Symptom Manage"},{"issue":"3","key":"2021031817243132400_pnaa398-B30","doi-asserted-by":"crossref","first-page":"798","DOI":"10.1007\/s11999-009-0963-y","article-title":"Preoperative pain catastrophizing predicts pain outcome after knee arthroplasty","volume":"468","author":"Riddle","year":"2010","journal-title":"Clin Orthop Relat Res"},{"issue":"4","key":"2021031817243132400_pnaa398-B31","doi-asserted-by":"crossref","first-page":"524","DOI":"10.1037\/1040-3590.7.4.524","article-title":"The Pain Catastrophizing Scale: Development and validation","volume":"7","author":"Sullivan","year":"1995","journal-title":"Psychol Assess"},{"issue":"1\u20132","key":"2021031817243132400_pnaa398-B32","doi-asserted-by":"crossref","first-page":"228","DOI":"10.1016\/j.pain.2004.03.035","article-title":"Pain-related fear and daily functioning in patients with osteoarthritis","volume":"110","author":"Heuts","year":"2004","journal-title":"Pain"},{"issue":"1","key":"2021031817243132400_pnaa398-B33","doi-asserted-by":"crossref","first-page":"116","DOI":"10.1186\/1471-2474-9-116","article-title":"The discordance between clinical and radiographic knee osteoarthritis: A systematic search and summary of the literature","volume":"9","author":"Bedson","year":"2008","journal-title":"BMC Musculoskelet Disord"},{"key":"2021031817243132400_pnaa398-B34","doi-asserted-by":"crossref","first-page":"b2844","DOI":"10.1136\/bmj.b2844","article-title":"Association between radiographic features of knee osteoarthritis and pain: Results from two cohort studies","volume":"339","author":"Neogi","year":"2009","journal-title":"BMJ"},{"issue":"4","key":"2021031817243132400_pnaa398-B35","doi-asserted-by":"crossref","first-page":"494","DOI":"10.1136\/ard.16.4.494","article-title":"Radiological assessment of osteo-arthrosis","volume":"16","author":"Kellgren","year":"1957","journal-title":"Ann Rheum Dis"},{"issue":"7","key":"2021031817243132400_pnaa398-B36","doi-asserted-by":"crossref","first-page":"865","DOI":"10.1136\/ard.2005.043653","article-title":"Relative impact of radiographic osteoarthritis and pain on quadriceps strength, proprioception, static postural sway and lower limb function","volume":"65","author":"Hall","year":"2006","journal-title":"Ann Rheum Dis"},{"issue":"2","key":"2021031817243132400_pnaa398-B37","doi-asserted-by":"crossref","first-page":"210","DOI":"10.2522\/ptj.20110124","article-title":"Early neuromuscular electrical stimulation to improve quadriceps muscle strength after total knee arthroplasty: A randomized controlled trial","volume":"92","author":"Stevens-Lapsley","year":"2012","journal-title":"Phys Ther"},{"issue":"4","key":"2021031817243132400_pnaa398-B38","doi-asserted-by":"crossref","first-page":"640","DOI":"10.1080\/10705511.2013.824781","article-title":"Statistical power to detect the correct number of classes in latent profile analysis","volume":"20","author":"Tein","year":"2013","journal-title":"Struct Equ Modeling"},{"issue":"4","key":"2021031817243132400_pnaa398-B39","doi-asserted-by":"crossref","first-page":"535","DOI":"10.1080\/10705510701575396","article-title":"Deciding on the number of classes in latent class analysis and growth mixture modeling: A Monte Carlo simulation study","volume":"14","author":"Nylund","year":"2007","journal-title":"Struct Equ Modeling"},{"issue":"10","key":"2021031817243132400_pnaa398-B40","doi-asserted-by":"crossref","first-page":"1109","DOI":"10.1016\/j.joca.2012.06.011","article-title":"Rasch analysis of the intermittent and constant osteoarthritis pain (ICOAP) scale","volume":"20","author":"Moreton","year":"2012","journal-title":"Osteoarthritis Cartilage"},{"issue":"12","key":"2021031817243132400_pnaa398-B41","first-page":"1833","article-title":"Validation study of WOMAC: A health status instrument for measuring clinically important patient relevant outcomes to antirheumatic drug therapy in patients with osteoarthritis of the hip or knee","volume":"15","author":"Bellamy","year":"1988","journal-title":"J Rheumatol"},{"issue":"10","key":"2021031817243132400_pnaa398-B42","doi-asserted-by":"crossref","first-page":"1488","DOI":"10.1002\/art.24118","article-title":"Strength training for treatment of osteoarthritis of the knee: A systematic review","volume":"59","author":"Lange","year":"2008","journal-title":"Arthritis Rheum"},{"issue":"3","key":"2021031817243132400_pnaa398-B43","doi-asserted-by":"crossref","first-page":"622","DOI":"10.1002\/art.38290","article-title":"Impact of exercise type and dose on pain and disability in knee osteoarthritis: A systematic review and meta-regression analysis of randomized controlled trials","volume":"66","author":"Juhl","year":"2014","journal-title":"Arthritis Rheumatol"},{"issue":"6","key":"2021031817243132400_pnaa398-B44","doi-asserted-by":"crossref","first-page":"807","DOI":"10.1002\/acr.23013","article-title":"Efficacy of tailored exercise therapy on physical functioning in patients with knee osteoarthritis and comorbidity: A randomized controlled trial","volume":"69","author":"de Rooij","year":"2017","journal-title":"Arthritis Care Res (Hoboken)"},{"issue":"8","key":"2021031817243132400_pnaa398-B45","doi-asserted-by":"crossref","first-page":"1310","DOI":"10.1093\/gerona\/gly202","article-title":"Comorbidity subgroups among Medicare beneficiaries seeking health care for musculoskeletal pain","volume":"74","author":"Lentz","year":"2019","journal-title":"J Gerontol A Biol Sci Med Sci"},{"issue":"9","key":"2021031817243132400_pnaa398-B46","doi-asserted-by":"crossref","first-page":"1693","DOI":"10.1249\/MSS.0000000000000294","article-title":"Resistance exercise, disability, and pain catastrophizing in obese adults with back pain","volume":"46","author":"Vincent","year":"2014","journal-title":"Med Sci Sports Exerc"},{"issue":"11","key":"2021031817243132400_pnaa398-B47","doi-asserted-by":"crossref","first-page":"694","DOI":"10.2519\/jospt.2010.3396","article-title":"Comparison of graded exercise and graded exposure clinical outcomes for patients with chronic low back pain","volume":"40","author":"George","year":"2010","journal-title":"J Orthop Sports Phys Ther"},{"issue":"5","key":"2021031817243132400_pnaa398-B48","doi-asserted-by":"crossref","first-page":"398","DOI":"10.1093\/ptj\/pzy024","article-title":"Advancing psychologically informed practice for patients with persistent musculoskeletal pain: Promise, pitfalls, and solutions","volume":"98","author":"Keefe","year":"2018","journal-title":"Phys Ther"},{"issue":"5","key":"2021031817243132400_pnaa398-B49","doi-asserted-by":"crossref","first-page":"478","DOI":"10.1016\/j.joca.2010.09.013","article-title":"OARSI-FDA initiative: Defining the disease state of osteoarthritis","volume":"19","author":"Lane","year":"2011","journal-title":"Osteoarthritis Cartilage"},{"issue":"5","key":"2021031817243132400_pnaa398-B50","doi-asserted-by":"crossref","first-page":"622","DOI":"10.1016\/j.joca.2014.03.009","article-title":"Trajectories and risk profiles of pain in persons with radiographic, symptomatic knee osteoarthritis: Data from the Osteoarthritis Initiative","volume":"22","author":"Collins","year":"2014","journal-title":"Osteoarthritis Cartilage"},{"issue":"7","key":"2021031817243132400_pnaa398-B51","doi-asserted-by":"crossref","first-page":"2243","DOI":"10.1002\/art.34415","article-title":"The natural history of radiographic knee osteoarthritis: A fourteen-year population-based cohort study","volume":"64","author":"Leyland","year":"2012","journal-title":"Arthritis Rheum"}],"container-title":["Pain Medicine"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/academic.oup.com\/painmedicine\/article-pdf\/22\/3\/653\/36641139\/pnaa398.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"http:\/\/academic.oup.com\/painmedicine\/article-pdf\/22\/3\/653\/36641139\/pnaa398.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,3,18]],"date-time":"2021-03-18T17:25:20Z","timestamp":1616088320000},"score":1,"resource":{"primary":{"URL":"https:\/\/academic.oup.com\/painmedicine\/article\/22\/3\/653\/6048944"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,12,25]]},"references-count":51,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2020,12,25]]},"published-print":{"date-parts":[[2021,3,18]]}},"URL":"https:\/\/doi.org\/10.1093\/pm\/pnaa398","relation":{},"ISSN":["1526-2375","1526-4637"],"issn-type":[{"value":"1526-2375","type":"print"},{"value":"1526-4637","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2021,3,1]]},"published":{"date-parts":[[2020,12,25]]}}}