TABLE 3.

Elemental composition [atomic% and atomic ratios (X/C)] of pediatric CVCs derived from XPS survey spectra.

CVCs	Surfaces	% composition							Atomic ratios
		Si 2p	S 2p	C 1s	N 1s	O 1s	Ba 3d	Na 1s	O/C	N/C
Untreated	Exterior	5.2 ± 0.0*	NA	80.7 ± 0.2	3.5 ± 0.2	10.7 ± 0.0	NA	NA	0.132 ± 0.000	0.043 ± 0.003
	Interior	1.3 ± 0.1	0.2 ± 0.0	85.8 ± 0.3	4.0 ± 0.1	8.6 ± 0.2	0.2 ± 0.0	NA	0.100 ± 0.002	0.046 ± 0.001
Serum-treated	Exterior	9.4 ± 1.1*	NA	69.7 ± 1.1	3.8 ± 0.5	16.9 ± 0.4	NA	0.1 ± 0.0	0.243 ± 0.010	0.055 ± 0.006
	Interior	2.1 ± 0.0	NA	77.4 ± 1.4	6.9 ± 0.7	13.2 ± 0.8	NA	0.4 ± 0.0	0.170 ± 0.013	0.089 ± 0.010

^∗Presented in mean ± standard deviation. NA means there is no signal. CVC, central venous catheter; XPS, X-ray photoelectron spectroscopy; Si, silicon; S, sulfur; C, carbon, N, nitrogen; O, oxygen; Ba, Barium; Na, sodium.