CRP and appendicitis: Abbreviation: B is the regression coefficient; OR, odds ratio; CI, confidence interval; CA, complicated appendicitis; UA, uncomplicated appendicitis; WCC, white blood cell count; CRP, C-reactive protein; NEUT, Neutrophil granulocyte; TBil, Total bilirubin; PCT, Procalcitonin; Cal, Calprotectin; PAS, Pediatric appendicitis score