| Groff (Oct 13, 2021) | Dec 2019 to Mar 2021 | 57/250,351 | Memory deficits 18.6% (IQR, 17.3% to 22.9%Cognitive impairment 17.1% (IQR, 14.1% to 30.5%)Headache 8% (IQR, 1.9% to 13.9%) |
| Lopez-Leon (Aug 09, 2021) | Dec 2019 to Jan 2021 | 15/47,910 | Headache 44% (13% to 78%) |
| Misra (Dec 07, 2021) | Dec 2019 to Dec 2020 | 350/145,721 | Headache 13% (12% to 15%)Dizziness 7% (5% to 8%)Confusion 11% (7% to 16%)Impaired consciousness 7% (5% to 10%) |
| Rogers (Jun 3, 2021) | Dec 2019 to Jul 2020 | 147/ 99,905 | Headache 20.7% (16.1% to 26.1%)Altered mental status 8.2% (4.4% to 14.8%) |
| Wang (Jun 11,2020) | Dec 2019 to May 2020 | 41/3,837 | Headache 9.2% (7.2 to 11.2)Dizziness 10.0% (5.9% to 14.2%)Confusion 5.2% (1.7% to 12.2%) |
| Collantes (Jul 15,2020) | Jan 2020 to Apr 2020 | 35/6,335 | Headache 12% (10% to 14%)Dizziness 8% (5% to 12%)Confusion 5% (2% to 14%) |
| Abdullahi (Jun 26, 2020) | Dec 2019 to Apr 2020 | 51/11,069 | Headache 12% (9% to 15%)Dizziness 10% (3% to 19%)Impaired consciousness 2% (1% to 2%) |
| Pinzon (May 29, 2020) [23] | Jan 2020 to Apr 2020 | 33/7,559 | Headache 10.9% (8.62% to 13.51%)Dizziness 8.7% (5.02% to 13.43%)Impaired consciousness 3.8% (0.16% to 12.04%) |
| Rogers (May 18, 2020) | Jan 2020 to Apr 2020 | 7/3,559 | Altered consciousness: 21% of patients who subsequently died |