COVID 19 hospitalized | |
COVID-19 severe or critically | |
Vitamins | |
vitamin C | Zhang |
5671 | Aisa-Alvarez, 2020 | 2 | 1 | 0 | excluded | risk of bias not avaialble | |
6104 | Rastogi, 2020 | 1 | 1 | 0 | risk of bias not avaialble | ||
6119 | COVID-VIT-D, 2022 | 1 | 1 | 3 | high risk of bias | ||
6123 | Annweiler (GERIA-COVID; regular intake of bolus vitamin D), 2020 | 1 | 13 | 0 | not a RCT | risk of bias not avaialble | |
6149 | Annweiler (GERIA-COVID; Vitamin D Supplementation After COVID-19 Diagnosis), 2020 | 1 | 13 | 0 | not a RCT | risk of bias not avaialble | |
6381 | Espitia-Hernandez, 2020 | 1 | 31 | 0 | not a RCT | risk of bias not avaialble | |
6381 | Espitia-Hernandez, 2020 | 1 | 31 | 0 | not a RCT | risk of bias not avaialble | |
6462 | Jamali Moghadam Siahkali, 2021 | 1 | 1 | 3 | high risk of bias | ||
6566 | Kumari, 2020 | 1 | 0 | 0 | risk of bias not avaialble | ||
7995 | Hazan, 2021 | 2 | 32 | 0 | excluded | not a RCT | risk of bias not avaialble |