CRP and appendicitis: AA, acute appendicitis; ANOVA, analysis of variance; CG, control group; NAP, nonspecific abdominal pain; SD, standard deviation; CRP, C-reactive protein; WBC, white blood cells; PLT, platelets; Hgb, hemoglobin; HCT, hematocrit; RDW, red cell distribution width; NEU, neutrophil; LYM, lymphocyte; MON, monocyte; NLR, neutrophil-to-lymphocyte ratio; RLR, RDW-to-lymphocyte ratio; MLR, monocyte-to-lymphocyte ratio; SII, systemic immune inflammation index