Table 1

Characterisation of the included studies (ordered by continent, country (by alphabetical order) and sample size (in decreasing order))

RefCountry of data collectionCOVID-19 detection methodDate of end of inclusionPopulationSettingSample size (n)Age, years (median)Male (%)Asymptomatic patients (%)
America (North)10CanadaRT-PCR19 February 2020AdultED1352844ND
15USACDC criteria4 February 2020Adult/childrenInpatient and outpatient2102955
11USART-PCR5 March 2020AdultICU217052
Range(21–210)(28–70)(44-55)
Asia9ChinaRT-PCR11 February 2020Adult/childrenND44 672NDND2
2631 January 2020Inpatient1 0994758ND
3812 February 2020NDInpatient4525852
55NDAdult/childrenInpatient2624849
436 February 2020AdultInpatient24951513
4413 February 2020Inpatient2015164ND
4531 January 2020Inpatient1915662
4713 February 2020Inpatient1855454
275 February 2020Inpatient1555456
2210 February 2020Inpatient1494554
363 February 2020Inpatient1405751
1928 January 2020Inpatient1385654
3424 January 2020Inpatient1375745
498 February 2020Inpatient1354753
562 February 2020Inpatient1214550
573 February 2020Inpatient10845*35
17NDInpatient10144*552
3920 January 2020Inpatient9955*68ND
4111 February 2020Adult/childrenInpatient915041
58NHC29 February 2020AdultInpatient904653
59RT-PCR4 February 2020Inpatient9050437
2523 January 2020Inpatient815052ND
3714 February 2020Adult/childrenInpatient804649
4815 January 2020AdultInpatient783850
60Chest CT3 February 2020Adult/childrenInpatient7342*564
50RT-PCR4 February 2020AdultInpatient694246ND
4230 January 2020ND6253*63
2926 January 2020Inpatient624156
7NHC31 January 2020Inpatient614151
40RT-PCR18 February 2020Inpatient565855
1829 February 2020Adult/childrenInpatient55494071
3026 January 2020AdultICU526067ND
2018 February 2020Inpatient514249
2827 January 2020Adult/childrenND514949
615 February 2020AdultInpatient425060
622 January 2020Inpatient414973
2429 January 2020Inpatient345641
4620 February 2020ED324647
1325 January 2020Inpatient276045
1218 February 2020Adult/childrenOutpatient24333379
86 February 2020AdultInpatient2140*26ND
63Chest CT27 January 2020Inpatient2151*6210
35RT-PCR5 February 2020Inpatient194840ND
21NDAdult/childrenInpatient193342
610 February 2020AdultInpatient174553
1629 January 2020Adult/childrenInpatient133477
2320 January 2020Inpatient125467
646 February 2020AdultOutpatient115073
65NDAdult/childrenOutpatient113746DNQ
3221 January 2020Outpatient731*57ND
31KoreaKCDC criteria14 February 2020AdultND28ND5411
33SingaporeRT-PCR3 February 2020Inpatient184750ND
Range(7–44 672)(33–60)(26–77)(2–79)
Europe14Belgium, Finland, France, Germany, Italy, Russia, Spain and SwedenRT-PCR21 February 2020Adult/childrenND38425524
Range(38)(42)(55)(24)
Range(7–44 672)(28–70)(26–77)(2–79)
  • *Mean.

  • CDC, Centers for Disease Control and Prevention; DNQ, described but not quantified; ED, emergency department; ICU, intensive care unit; KCDC, Korea Centers for Disease Control and Prevention; NA, not applicable; ND, not described; NHC, National Health Commission; Ref, reference; RT-PCR, reverse transcription PCR.