Pryor et al. analysed age, sex, type of chest pain, smoking, dyslipidaemia, diabetes and the interaction between age and smoking, age and dyslipidaemia, sex and smoking, and age and sex, of which type of chest pain and the presence of diabetes were significant predictors. This model resulted in an AUC of 0.838. After including CTCS, the AUC increased to 0.901 which was a statistically significant improvement (p < 0.001). In the expanded model diabetes was no longer a significant predictor (Table 2).