Table 1

Characteristics of study population and comparisons of FeNO levels

VariableCategoryN (%)GM of year 5 FeNO (GSD)*p Value†Mean of FeNO change (SD)p Value†
SexFemale640 (52.8)14.8 (15.9)0.101.3 (12.5)0.72
Male571 (47.2)16.6 (18.7)1.0 (13.7)
Age (years)<10420 (34.7)13.7 (13.9)<0.011.5 (11.4)0.37
10–11611 (50.3)16.1 (18.4)0.7 (13.3)
>11180 (14.9)18.5 (19.8)2.1 (15.8)
Race/ethnicityNon-Hispanic White451 (37.2)14.9 (14.9)0.070.7 (12.1)0.01
Hispanic680 (56.2)15.5 (17.1)1.4 (12.8)
African American17 (1.4)25.7 (45.8)−7.5 (27.9)
Asian54 (4.5)20.2 (20.6)3.6 (15.9)
Other9 (0.7)15.4 (16.5)8.2 (14.3)
AsthmaYes136 (11.2)22.3 (24.9)<0.010.01 (14.6)0.32
No1075 (88.8)14.8 (15.8)1.3 (12.9)
History ofYes726 (59.9)17.3 (19.7)<0.011.3 (14.5)0.78
Respiratory allergyNo485 (40.1)13.04 (12.4)1.1 (10.6)
Exposure to secondhand smokeYes42 (3.5)17.8 (18.2)0.25−4.3 (16.2)0.03
No1163 (96.5)15.5 (17.2)1.3 (12.9)
Medication use for asthmaYes91 (7.5)26.0 (31.1)0.0002−0.09 (21.7)0.55
No1120 (92.5)14.8 (15.3)1.27 (12.1)
CommunityLong Beach67 (5.53)14.6 (16.4)0.081.9 (10.4)<0.01
Mira Loma170 (14.04)13.9 (13.5)2.8 (10.3)
Riverside111 (9.17)16.5 (16.6)−0.5 (11.1)
San Dimas144 (11.89)20.8 (26.5)−2.9 (19.2)
Upland175 (14.45)14.8 (16.8)0.7 (13.6)
Glendora228 (18.83)14.4 (14.2)2.5 (11.4)
Anaheim115 (9.50)15.2 (13.7)−0.6 (13.2)
Santa Barbara201 (16.60)15.6 (17.3)3.4 (12.0)
  • *Results based on geometric means (GM) and geometric SDs (GSD) due to skewness of year 5 FeNO data.

  • †p Values are based on test for comparisons of FeNO levels across categories.