Table 2.

Association between gender, smoking, atopy, asthma and fraction of exhaled nitric oxide (FeNO)

Variable		FeNO (ppb), geometric mean (SD)	p Value*
Gender	Male (n=376)	22 (2)	<0.001
	Female (n=423)	15 (2)
Current smoking	Yes (n=198)	14 (2)	<0.001
	No (n=601)	19 (2)
Atopy	Yes (n=324)	28 (2)	<0.001
	No (n=475)	13 (2)
Asthma	Yes (n=155)	29 (3)	<0.001
	No (n=644)	16 (2)
Rhinitis	Yes (n=310)	25 (2)	<0.001
	No (n=489)	15 (2)
Current inhaled corticosteroid use in patients with asthma (n=155)	Yes (n=65)	30 (3)	0.65
	No (n=90)	28 (3)

^*Two-sided t test comparing logarithmically-transformed FeNO for each variable.