“…Each analysis was conducted separately, controlling for patient age and cardiovascular comorbidities, which included previously diagnosed ischaemic heart disease, diabetes mellitus, hypertension, hypercholesterolaemia and family history of AMI in a first-degree relative <55 years. All of these have been associated with ACS in a recent meta-analysis 16. The purpose of these control variables was to assess the importance of each symptom within each subgroup after adjusting for readily available data—age and cardiovascular comorbidities—outside of test results that would be available to the clinician on initial assessment.…”