National Emergency Laparotomy Audit (NELA) Risk Calculator
https://data.nela.org.uk/riskcalculator/
Portsmouth Physiological and Operative Severity Score for the Enumeration of Mortality and Morbidity (P-POSSUM)
http://www.riskprediction.org.uk/index-pp.php
ACS National Surgical Quality Improvement Program (NSQIP) Surgical Risk Calculator
https://riskcalculator.facs.org/RiskCalculator/
Nottingham Hip Fracture Score
http://www.riskprediction.org.uk/index-nhfs.php
euroSCORE II
http://euroscore.org/calc.html
Subarachnoid Hemorrhage International Trialists (SAHIT)
Risk of mortality and unfavourable outcome for subarachnoid haemorrhage.
Modified Caprini risk assessment model for VTE in general surgical patients
https://www.uptodate.com/contents/image?imageKey=PULM%2F83739&topicKey=PULM%2F1339
Society of Thoracic Surgeons (STS) Short-Term Risk Calculator
