Distribution of CRP levels according to age in the RV-positive patients. The vertical axis reflects the CRP level(mg/dl) and horizontal axis was divided by dividing each age into 10 years. The line parallel to the horizontal axis (CRP level 0.5) indicate the normal value. The gray squares (◆) and black squares (■), respectively, indicate CRP and predictive value of CRP. The two circles indicate the area where the distribution of CRP is concentrated.