The non-HDL-C/HDL-C ratio (NHHR) predicts the CSF with 74% sensitivity and 72% specificity at the best cut-off value (3.3). When non-traditional lipid profiles were pairwise compared with ROC analysis to predict the CSF, the NHHR was superior to all other non-traditional lipid profiles in predicting CSF. AIP, atherogenic index of plasma; AUC, area under the curve; CI, confidence interval; CRI-I, Castelli’s risk index-I; CRI-II, Castelli’s risk index-II; CSF, coronary slow flow; HDL-C, high-density lipoprotein cholesterol; LCI, lipoprotein combined index; ROC, receiver operating characteristic; TC, total cholesterol; ΔAUC, differences between areas under the curve.