Reference ranges derived from the multivariate model in normal subjects

Atopy status*	Smoking status	Reference range for FE_NO (ppb)
Female
No atopy	Current smoker	5.9-30.5
	Ex-smoker	6.4-32.2
	Nonsmoker	7.5-37.4
Atopy	Current smoker	6.9-36.4
	Ex-smoker	7.6-38.5
	Nonsmoker	8.8-44.6
Male
No atopy	Current smoker	7.5-38.4
	Ex-smoker	8.1-40.8
	Nonsmoker	9.5-47.4
Atopy	Current smoker	8.8-45.9
	Ex-smoker	9.6-48.6
	Nonsmoker	11.2-56.5

Reference_range_eNO.htm

FE_NO: fraction of nitric oxide in expired breath.
* Atopy: a positive skin prick test to at least one common allergen.

Reproduced with permission from: Travers, J, Marsh, S, Aldington, S, et al. Reference ranges for exhaled nitric oxide derived from a random community survey of adults. Am J Respir Crit Care Med 2007; 176:238. Copyright ©2007 American Thoracic Society.

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Reference ranges derived from the multivariate model in normal subjects