Randomisation and masking
NSTEMI
Eligible clusters were centrally randomised by the Clinical Trials Research Unit to the use of the GRS and suggested management or standard care (1:1). Randomisation used minimisation with a computer generated random element to ensure cluster specific volume of patients admitted to hospital with NSTEMI and primary percutaneous coronary intervention capability was similar for each study arm. When site staff were shared across hospitals, these hospitals were considered a single cluster. Site staff and participants could not be blinded.