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A total of 77 peer-reviewed publications were identified between January 1, 2020 and April 9, 2020 from PubMed, Google Scholar, and Chinese Medical Journal databases. Subsequently, meta-analysis of 40 non-overlapping studies, comprising of 4844 patients from seven countries, was conducted to see differences in clinical characteristics and laboratory outcomes across patients from different geographical regions (Wuhan, other parts of China and outside China), severity (non-severe, severe and fatal) and age groups (adults and children). Patients from Wuhan had a higher mean age (54.3 years) and rates of dyspnea (39.5%) compared with patients from other parts of China and outside China. Myalgia, fatigue, acute respiratory distress syndrome (ARDS) and fatalities were also significantly more prevalent among Wuhan patients. A significant dose\u2013response increase in prevalence of diabetes, D-dimer, white blood cells, neutrophil levels and ARDS was seen from non-severe to severe and fatal outcomes. A significant increase in mean duration of symptom onset to admission was seen between non-severe cases (4.2 days) and severe and fatal cases (6.3 days and 8.8 days, respectively). Proportion of asymptomatic cases was higher in children (20%) compared with adults (2.4%). In conclusion, patients with COVID-19 from Wuhan displayed more severe clinical disease during the early phase of the pandemic, while disease severity was significantly lesser among pediatric cases. This review suggests that biomarkers at admission may be useful for prognosis among patients with COVID-19.<\/jats:p>","DOI":"10.1136\/jim-2021-001858","type":"journal-article","created":{"date-parts":[[2021,6,16]],"date-time":"2021-06-16T13:00:21Z","timestamp":1623848421000},"page":"1287-1296","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":29,"title":["Epidemiological and Clinical Characteristics of Non-Severe and Severe Pediatric and Adult COVID-19 Patients across Different Geographical Regions in the Early Phase of Pandemic: A Systematic Review and Meta-Analysis of Observational Studies"],"prefix":"10.1177","volume":"69","author":[{"given":"Pearleen Ee Yong","family":"Chua","sequence":"first","affiliation":[{"name":"Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shimoni Urvish","family":"Shah","sequence":"additional","affiliation":[{"name":"Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hao","family":"Gui","sequence":"additional","affiliation":[{"name":"Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiayun","family":"Koh","sequence":"additional","affiliation":[{"name":"Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jyoti","family":"Somani","sequence":"additional","affiliation":[{"name":"Division of Infectious Diseases, National University Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9788-701X","authenticated-orcid":false,"given":"Junxiong","family":"Pang","sequence":"additional","affiliation":[{"name":"Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2021,10,1]]},"reference":[{"key":"bibr1-jim-2021-001858","doi-asserted-by":"publisher","DOI":"10.15585\/mmwr.mm6915e4"},{"key":"bibr2-jim-2021-001858","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.m1548"},{"key":"bibr3-jim-2021-001858","doi-asserted-by":"publisher","DOI":"10.1016\/j.ppedcard.2020.101232"},{"key":"bibr4-jim-2021-001858","unstructured":"Organization WH. 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