COG2 and polyp of large intestine: The ROC showed that the AUC for the diagnosis of colorectal polyps using the individual and combined detection of the NLR, MCH, MCHC, cystatin C, TG, LDL-C, CEA, P. gingivalis, F. nucleatum, P. intermedia, R. gnavus, B. ovatus, and P. distasonis were 0.696, 0.726, 0.742, 0.771, 0.829, 0.731, 0.785, 0.759, 0.738, 0.786, 0.739, 0.764, 0.757, and 0.996, respectively.