Fig. 2

Restricted cubic spline of CABSI risk. A In period 1, OR value increased rapidly in the first 6.5 days of femoral-vein catheterization and became stable after the 6.5th day. B In period 1, OR value increased rapidly in the first 7 days of subclavian-vein catheterization and became stable after the 7th day. C In period 1, OR value increased rapidly in the first 6 days of jugular-vein catheterization and became stable after the 6th day. D In period 2, OR value increased rapidly in the first 5 days of femoral-vein catheterization and became stable after the 5th day. E In period 2, OR value increased rapidly in the first 5.5 days of subclavian-vein catheterization. On days 6 to 8 after insertion OR did not change significantly, and began to increase on the 9th day. F In period 2, OR value did not change significantly in the first 7 days of jugular-vein catheterization. On days 7 to 12 after insertion OR gradually increased, and began to decrease on the 13th day. RCS, indicates Restricted Cubic Spline; CABSI, entral Venous Catheter-associated Bloodstream Infection; FEM, Femoral; SC, Subclavian; IJ, Internal Jugular