CRP and juvenile polyposis syndrome: For the PJI group, the median (interquartile range; IQR) values of serum CRP (mg/L), synovial CRP (mg/L), serum IL-6 (pg/mL) and synovial IL-6 (pg/mL) were 18.79 (7.60–33.66), 8.62 (4.49–13.58), 17.80 (9.85–28.74) and 32,830.80 (16,163.81–60,259.27), respectively.