The median serum RPR titer was significantly higher in CSF RPR+ patients than that in CSF RPR- GP patients, 1:8 [IQR 1:4–1:32] vs. 1:4 [IQR 1:4–1:8] (P < 0.001). The number of CSF RPR+ patients with serum RPR titer≥1:32 was significantly higher when compared with ...