The combined parameter NLR & RDW - SD had the best diagnostic efficiency ( AUC was 0 . 938 ) and when the cut - off value was 1 . 046 , the sensitivity and the specificity were 90 . 0 % and 84 . 7 % respectively , followed by the fitting parameter NLR & RDW - CV ( AUC = 0 . 923 ) .