Table 1.

Characteristics of Study Population and Comparisons of FeNO Levels

Variable	Category	N (%)	GM of Year 5 FeNO (GSD)*	P-Value†	Mean of FeNO Change (S.D.)	P-Value†
Sex	Female	640 (52.8)	14.8 (15.9)	0.10	1.3 (12.5)	0.72
	Male	571 (47.2)	16.6 (18.7)		1.0 (13.7)
Age (yrs)	<10	420 (34.7)	13.7 (13.9)	<0.01	1.5 (11.4)	0.37
	10–11	611 (50.3)	16.1 (18.4)		0.7 (13.3)
	>11	180 (14.9)	18.5 (19.8)		2.1 (15.8)
Race/Ethnicity	Non-Hispanic White	451 (37.2)	14.9 (14.9)	0.07	0.7 (12.1)	0.01
	Hispanic	680 (56.2)	15.5 (17.1)		1.4 (12.8)
	African American	17 (1.4)	25.7 (45.8)		−7.5 (27.9)
	Asian	54 (4.5)	20.2 (20.6)		3.6 (15.9)
	Other	9 (0.7)	15.4 (16.5)		8.2 (14.3)
Asthma	Yes	136 (11.2)	22.3 (24.9)	<0.01	0.01 (14.6)	0.32
	No	1075 (88.8)	14.8 (15.8)		1.3 (12.9)
History of Respiratory Allergy	Yes	726 (59.9)	17.3 (19.7)	<0.01	1.3 (14.5)	0.78
	No	485 (40.1)	13.04 (12.4)		1.1 (10.6)
Exposure to Second Hand Smoke	Yes	42 (3.5)	17.8 (18.2)	0.25	−4.3 (16.2)	0.03
	No	1163 (96.5)	15.5 (17.2)		1.3 (12.9)
Medication Use for Asthma	Yes	91 (7.5)	26.0 (31.1)	0.0002	−0.09 (21.7)	0.55
	No	1120 (92.5)	14.8 (15.3)		1.27 (12.1)
Community	Long Beach	67 (5.53)	14.6 (16.4)	0.08	1.9 (10.4)	<0.01
	Mira Loma	170 (14.04)	13.9 (13.5)		2.8 (10.3)
	Riverside	111 (9.17)	16.5 (16.6)		−0.5 (11.1)
	San Dimas	144 (11.89)	20.8 (26.5)		−2.9 (19.2)
	Upland	175 (14.45)	14.8 (16.8)		0.7 (13.6)
	Glendora	228 (18.83)	14.4 (14.2)		2.5 (11.4)
	Anaheim	115 (9.50)	15.2 (13.7)		−0.6 (13.2)
	Santa Barbara	201 (16.60)	15.6 (17.3)		3.4 (12.0)

^*Results based on geometric means (GM) and geometric standard deviations (GSD) due to skewness of Year 5 FeNO data.

^†p-values are based on test for comparisons of FeNO levels across categories.