TABLE 1. Characteristics of subjects tested for FENO.

	Number (percent)
Characteristic	Children followed up to age 12 with FENO measurement	Children followed up to age 12 without FENO measurement
Sex
Male	160 (58)	76 (48)
Female	117 (42)	81 (52)
Race
White	233 (84)	116 (74)*
Black	23 (8)	14 (9)
Hispanic	6 (3)	12 (7)*
Asian Other	15 (5)	15 (10)
Maternal Asthma	79 (29)	48 (31)
Age at FENO measurement (years)	Mean = 11.7, Range = 11 to 13.9	NA
FENO (ppb)	Median= 16, IQR = 11.0 to 32.0	NA

^*p<0.05 for comparison with children followed to age 12 with FENO measurement