There was no association between obesity and JADAS-27 in the univariable linear regression (beta coefficient = 0.04; 95%CI = -1.19, 1.27; p = 0.95), neither between obesity and physician's VAS (beta coefficient = 0.08; 95%CI = -0.28, 0.44; p = 0.66), parent's VAS (beta coefficient = -0.35; 95%CI = -0.77, 0.07; p = 0.10), ESR (OR = 0.53; 95%CI = 0.21, 1.41; p = 0.18), number of active joints (beta coefficient = 0.22; 95%CI = -0.39, 0.83; p = 0.48), or CRP (beta coefficient = 0.33; 95%CI = -1.19, 1.85; p = 0.67). This evidence concerns the gene CRP and obesity disorder.