Analysis of variance using principal component analysis (PCA) was applied only on clinical and anthropometric data of IBD patients (%FFM, Tanner score, age, height z-score, weight z-score, BMI z-score, growth velocity z-score, fecal calprotectin, erythrocyte sedimentation rate (ESR), CRP, urea, IGF-1, insulin-like growth factor-binding protein 3 (IGFBP-3), caloric intake, and resting energy expenditure (REE)). The gene discussed is CRP; the disease is inflammatory bowel disease.