Table 2.

Characteristics of Primary EBV Infection in Pre-Transplant EBV naïve children.

Number (%) Unless Specified	Total N=56	UVL N=11	LVL N=30	CHL N=15	p value
Age at Tx (years: median [IQR])	5.7 [3.0–13.9]	5.5 [4.6–12.9]	9.1 [2.6–14.5]	3.8 [2.9–7.0]	0.12
Age of Primary EBV infection (years: median [IQR])	7.2 [3.7–16.1]	6.9 [4.4–16.2]	12.0* [5.7–17.0]	4.9* [3.0–7.5]	0.023
Timing of primary EBV infection after Tx (months: median [IQR])	7.4 [2.4–26.1]	24.4 [1.4–26.1]	7.1 [2.4–58.9]	7.3 [2.4–16.3]	0.81
EBV serology N (%)
D+/R−	50 (89)	9 (82)	29 (97)	12 (80)
D−/R−	5 (9)	2 (18)	0 (0)	3 (20)
Incomplete data	1 (2)	0 (0)	1 (3)	0 (0)

Tx: Transplant, IQR: interquartile range, UVL: undetectable viral load carrier, LVL: low detectable viral load carrier, CHL: Chronic EBV high load carrier, D: donor, R: recipient, Mark (*) was used when post hoc analysis showed statistical difference