Table 3.

Regression analyses of effects of group status, family SES, and their interaction on exhaled nitric oxide (FeNO) responses to an acute psychosocial stressor

Variable	b	SE	t	p
Baseline FeNO	−0.08	0.02	5.49	<.001
Atopy	4.90	1.40	3.51	.001
Severity	−2.82	1.34	2.10	.04
ICS use	0.17	0.19	0.87	.39
Beta agonist use	−0.04	0.19	0.21	.84
Age	−0.04	0.26	0.17	.86
Sex	0.12	1.28	0.09	.93
Ethnicity	−0.51	0.39	1.30	.20
Family income	0.04	1.00	0.04	.96
Group (asthma vs. healthy)	2.55	2.50	1.02	.31
Income × Group	−3.06	1.26	2.44	.02
Baseline FeNO	−0.09	0.01	6.44	<.001
Atopy	5.54	1.40	3.96	<.001
Severity	−1.56	1.51	1.03	.31
ICS use	0.18	0.20	0.87	.39
Beta agonist use	−0.14	0.18	0.82	.42
Age	0.01	0.27	0.05	.96
Sex	0.43	1.26	0.34	.74
Ethnicity	0.94	0.56	1.70	.10
Parent occupation	2.07	1.11	1.87	.07
Group (asthma vs. healthy)	−0.13	2.75	0.05	.96
Occupation × Group	−4.46	1.38	3.24	.002

Note. Regression coefficients are presented first for the block of covariates controlled in all analyses (baseline FeNO, atopic status, asthma severity, ICS use, beta agonist use, age, sex ethnicity), second for the main effects of family SES and group status, and third for the interaction between family SES and group. The top half of the table reports coefficients when family income was included as the SES variable. The bottom half of the table reports coefficients when parent occupation was used as the SES variable. The dependent variable was change in FeNO from pre-stressor to post-stressor.