Table 1. Selected Characteristics of CHS FeNO Study Participants and Children by Asthma Status*.
| All Children | Children without Asthma | Children with Asthma | |||||||
|---|---|---|---|---|---|---|---|---|---|
| N** | FeNO Mean(SD) $ | P-Value † | N** | FeNO Mean(SD) $ | P-Value † | N** | FeNO Mean(SD) $ | P-Value † | |
| Gender | |||||||||
| Female | 793(51.4%) | 14.4(2) | <0.0001 | 657(53.1%) | 13.4(1.9) | <0.0001 | 136(44.6%) | 19.8(2.2) | 0.031 |
| Male | 749(48.6%) | 17.4(2.2) | 580(46.9%) | 15.7(2.1) | 169(55.4%) | 24.4(2.4) | |||
| Race/Ethnicity | |||||||||
| Hispanic White | 873(56.6%) | 15.5(2.1) | 0.003 | 711(57.5%) | 14.2(2.1) | 0.0003 | 162(53.1%) | 22.8(2.3) | 0.919 |
| Non-Hispanic White | 482(31.3%) | 15.5(2) | 381(30.8%) | 14.3(1.9) | 101(33.1%) | 21.3(2.2) | |||
| African American | 27(1.8%) | 19.4(2.1) | 21(1.7%) | 19.3(2) | 6(2.0%) | 19.8(2.5) | |||
| Asian | 64(4.2%) | 22(2.2) | 51(4.1%) | 21.1(2.2) | 13(4.3%) | 25.7(2.3) | |||
| Others | 96(6.2%) | 14.6(2.2) | 73(5.9%) | 12.9(1.9) | 23(7.5%) | 21.6(2.9) | |||
| Rhinitis in Last 12 Months | |||||||||
| None | 1031(66.9%) | 14.4(2) | <0.0001 | 881(71.2%) | 13.7(2) | <0.0001 | 150(49.2%) | 19.2(2.2) | 0.002 |
| 1–12 months ago | 96(6.2%) | 14.8(1.9) | 71(5.7%) | 13.4(1.8) | 25(8.2%) | 19.5(1.9) | |||
| 7 Days—1 month ago | 152(9.9%) | 18.0(2.2) | 98(7.9%) | 15.1(2.1) | 54(17.7%) | 24.8(2.3) | |||
| Within last 7 Days | 250(16.2%) | 21.6(2.4) | 175(14.1%) | 19(2.2) | 75(24.6%) | 29.2(2.5) | |||
| Inhaled Corticosteroid Use in Last 12 Months ‡ | |||||||||
| Did not use | —- | —- | —- | —- | 257(84.3%) | 21(2.3) | 0.007 | ||
| Used 1–12 months ago | —- | —- | —- | —- | 15(4.9%) | 23.9(2.3) | |||
| Used within last 1 month | —- | —- | —- | —- | 28(9.2%) | 35.1(2.4) | |||
| Total | 1542 | 15.8(2.1) | 1237 | 14.5(2) | 305 | 22.2(2.3) | |||
*: The participants in this study are children who were enrolled in the Southern California Children’s Health Study (CHS) and had FeNO measurements at 2009–2010 school year.
**: Numbers do not always sum to the total due to missing data.
†: Tests for the equality of group means of log-transformed FeNO (did not include missing category).
‡: The distribution of Inhaled Corticosteroid Use in Last 12 Months is only considered in the sub-cohort of children with asthma, since only children with asthma received the medication.
$: Geometric mean and geometric standard deviation.