| 25(OH)D | 25-Hydroxyvitamin D |
| BMI | Body Mass Index |
| COVID-19 | Coronavirus Disease 19 |
| ICU | Intensive Care Unit |
| IFN-γ, I | Interferon Gamma, type 1 |
| IL-1,6,18,10 | Interleukin-1,6,18,10 |
| n | Total number of cases |
| O2 | Oxygen |
| SARS-CoV-2 | Severe Acute Respiratory Syndrome Coronavirus-2 |
| TNF-α | Tumour Necrosis Factor Alpha |