Table 1.
Relationships between FeNO levels and demographic and atopic characteristics*
| FeNO Quartiles | ||||||
|---|---|---|---|---|---|---|
| Parameter | ≤ 10.5ppb (1st Quartile) N=22 |
10.6ppb to 14.0ppb (2nd Quartile) N=23 |
14.1ppb to 24.4ppb (3rd Quartile) N=21 |
> 24.4ppb (4th Quartile) N=23 |
P-value | |
| Demographics: | ||||||
| Age (y) (mean ± SD) | 3.2 +/− 0.8 | 3.4 +/− 1.1 | 3.4 +/− 0.9 | 3.3 +/− 1.2 | 0.6 | |
| Gender: Male n (%) | 16 (72.7%) | 17 (73.9%) | 13 (61.9%) | 15 (65.2%) | 0.44 | |
| Race: white n (%) | 17 (77.3%) | 16 (69.6%) | 14 (66.7%) | 18 (78.3%) | 0.98 | |
| Minority: Non-white n (%) | 5 (22.7%) | 7 (30.4%) | 7 (33.3%) | 5 (21.7%) | 0.98 | |
| Ethnicity: Hispanic or Latino n (%) | 2 (9.1%) | 5 (21.7%) | 9 (42.9%) | 10 (43.5%) | 0.004 | |
|
Season of Recruitment: |
Spring n (%) | 4 (18.2%) | 3 (13%) | 5 (23.8%) | 6 (26.1%) | |
| Summer n (%) | 13 (59.1%) | 18 (78.3%) | 10 (47.6%) | 10 (43.5%) | 0.12 | |
| Fall n (%) | 5 (22.7%) | 2 (8.7%) | 6 (28.6%) | 7 (30.4%) | ||
| Atopic Characteristics: | ||||||
|
Number of positive skin tests, per child, to aeroallergens (maximum 8) (mean ± SD) |
0.7 +/− 0.9 | 0.7 +/− 1.1 | 1.5 +/− 1.8 | 1.4 +/− 1.6 | 0.03 | |
|
Number of positive skin tests, per child, to food allergens (maximum 3) (mean ± SD) |
0.6 +/− 0.9 | 0.2 +/− 0.5 | 0.6 +/− 0.9 | 0.3 +/− 0.8 | 0.62 | |
|
IgE (kU/L) (geometric means and coefficients of variation) |
44.8 +/− 4.0 | 52.7 +/− 5.1 | 89.9 +/− 4.0 | 55.9 +/− 6.6 | 0.44 | |
|
Eosinophils (%) (geometric means and coefficients of variation) |
3.8 +/− 2.0 | 3.2 +/− 1.9 | 3.8 +/− 1.8 | 5.0 +/− 2.0 | 0.12 | |
| Presence of eczema n (%) | 1 (4.5%) | 2 (8.7%) | 1 (4.8%) | 3 (13%) | 0.39 | |
| Parental asthma n (%) | 7 (31.8%) | 10 (43.5%) | 7 (35%) | 9 (39.1%) | 0.26 | |
| Positive API n (%) | 16 (72.7%) | 13 (56.5%) | 11 (52.4%) | 13 (56.5%) | 0.27 | |
*
Data are expressed as number of children (% of children in each quartile) except at noted.