Database search strategy of MEDLINE and EMBASE for the period January 2019 to 5 January 2021
| COVID-19 (TI, AB, KW) | Risk stratification (TI, AB, KW) | Mortality (TI, AB, KW) |
| COVID-19 | Prognos*4 adj2 model/score/algorithm /tool | Hospital Mortality (MeSH) |
| COVID-2019 | Clinical decision tool | Death*1 |
| SARS-CoV-2 | Predicti* adj2 model/score/algorithm /tool | Mortality |
| Severe acute respiratory syndrome coronarvirus 2 | Risk adj2 model /predicti*/score/tool/ stratification | Fatal*5 |
| 2019-nCoV | Scor*3 system*1 | |
| Mortality adj1 scor*3 |
The following search concepts were combined using Boolean operators: COVID-19 (TI, AB, KW) AND Risk stratification (TI, AB, KW) AND Mortality (TI, AB, KW)
AB, abstract; KW, keywords; TI, title, the '/' indicated a different variation.