Table 1.

Patient characteristics.

	Index	Matched Control
	N=29	N=116	P value
Age group, no. (%)			.218
< 1 year old	21 (72.4)	80 (69.0)
1–13 years old	6 (20.7)	25 (21.6)
> 13 years old	2 (6.9)	11 (9.5)
Gender, no. (% male)	19(65.5)	65 (56.0)	.570
Race and ethnicity, no. (%)			.259
Non-Hispanic white	17 (58.6)	56 (48.3)
African-American	5 (17.2)	15 (12.9)
Hispanic white	1 (3.4)	11 (9.5)
Others	6 (20.7)	34 (29.3)
PIM2, mean±SD	0.09±0.14	0.07±0.10	.859
Surgical, no. (%)	23 (79.3)	82 (70.7)	.465
Disease category, no. (%)			.615
CHD	13 (44.8)	54 (46.6)
Cancer	1 (3.4)	6 (5.2)
Trauma	4 (13.8)	18 (15.5)
Sepsis	1 (3.4)	2 (1.7)
Others	10 (34.5)	36 (31.0)
ICU days prior to CVL insertion, mean±SD	0.7±2.0	0.5±0.8	.736
MV days prior to CVL insertion, mean±SD	0.4±1.9	0.1±0.2	.720

Index patients with central venous line (CVL)-related deep venous thrombosis were matched to control patients without venous thromboembolism based on age group, disease category, severity of illness score (Pediatric Index of Mortality 2 [PIM2]) and number of days in the intensive care unit (ICU) prior to CVL insertion. CHD – congenital heart disease; MV – mechanical ventilation.