Table 4. Immunologic status at 2 and 4 years of age in relation to infantile peanut introduction.

	2 years old					4 years old
	Total number	Median (IQR)	BLD number	(%)	P-valuea	Total number	Median (IQR)	BLD number	(%)	P-valuea
Ara h 2 specific IgE (BUe/mL)
Infantile peanut introduction
Yes	204	0.005 (0.005–0.005)	201	(98.5)	0.71	187	0.005 (0.005–0.005)	183	(97.8)	0.57
No	4,033	0.005 (0.005–0.005)	3,985	(98.8)		3,766	0.005 (0.005–0.005)	3,707	(98.4)
Ara h 2 specific IgG4 (BUg4/mL)
Infantile peanut introduction
Yes	204	60.9 (58.8–63.5)	0	(0.0)	0.07	187	51.8 (50.1–56.0)	44	(22.7)	0.36
No	4,033	60.6 (58.3–62.9)	0	(0.0)		3,767	51.9 (50.2–54.6)	855	(21.7)

BLD, below the detection limit; IQR, interquartile range.

^aThe Wilcoxon rank sum test was used for the analysis.