IL13 and appendicitis: In the univariate logistic regression, high concentrations of IL-13 were associated with an increased risk of complicated appendicitis [OR 1.02 (95% CI 1.01–1.04) p = 0.005], which remained in the multivariate analysis [aOR 1.02 (95% CI 1.01–1.04), p = 0.01].