Table 1

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-19Prognos*4 adj2 model/score/algorithm /toolHospital Mortality (MeSH)
COVID-2019Clinical decision toolDeath*1
SARS-CoV-2Predicti* adj2 model/score/algorithm /toolMortality
Severe acute respiratory syndrome coronarvirus 2Risk adj2 model /predicti*/score/tool/ stratificationFatal*5
2019-nCoVScor*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.