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Table 2 Mean values (with 95% confidence intervals) for FENO, stratified by smoking status and sex

From: Factors affecting exhaled nitric oxide measurements: the effect of sex

F E NO (ppb) Mean 95% C.I. All subjects Males Females
All Study members n = 895
13.4
(12.8, 14.1)
n = 471
15.3
(14.3, 16.3)
n = 424
11.6
(11.0, 12.4)
All current smokers (within last 12 months) n = 395
10.4
(9.7, 11.1)
n = 235
11.6
(10.6, 12.6)
n = 160
8.9
(8.1, 9.8)
Current smokers who smoked on the day of F E NO testing n = 235
8.2
(7.6, 8.8)
n = 133
8.8
(7.9, 9.7)
n = 102
7.4
(6.7, 8.2)
Current smokers who did not smoke on day of F E NO testing n = 160
14.9
(13.4, 16.6)
n = 102
16.6
(14.7, 18.9)
n = 58
12.3
(10.2, 14.7)
Ex-smokers (greater than 12 months) n = 107
16.0
(14.3, 17.8)
n = 36
21.1
(17.6, 25.3)
n = 71
13.8
(12.2, 15.7)
Never smokers n = 393
16.6
(15.6, 17.7)
n = 200
20.0
(18.3, 22.0)
n = 193
13.6
(12.5, 14.8)