Table 1 Geometric mean FeNO levels (ppb) in Mylar bags immediately after collection by subjects’ demographic and health characteristics

Total

48

33.4

(28.4, 39.3)

Sex

 Male

22

37.3

(28.8, 48.5)

0.221

 Female

26

30.4

(24.9, 37.1)

Age (years)

 <40

20

31.9

(26.1, 39.0)

0.585

 ≥40

28

34.6

(27.2, 43.9)

Wheezing

 Yes

8

57.7

(36.2, 91.8)

0.002

 No

40

30.0

(25.7, 34.9)

Allergic rhinitis or pollinosis

 Yes

20

33.5

(26.3, 42.7)

0.973

 No

28

33.3

(27.3, 40.6)

Cigarette Smoking

 Never

33

33.9

(28.1, 41.0)

0.102

 Ever

9

41.7

(26.5, 65.6)

 Current

6

22.0

(18.3, 26.5)