CRP and juvenile polyposis syndrome: As showed in Tables 2 and 3, the sensitivity of serum CRP, ESR and D-Dimer is 0.68, 0.74 and 0.71 respectively; the specificity of serum CRP, ESR, and D-Dimer is 0.93, 0.87, and 0.80 respectively, there are no statistically significant differences when compared with sensitivity and specificity of CRP, ESR, and D-Dimer in the diagnosis of PJI among patients from the three different groups.