Table 1 Mean values (with 95% confidence intervals) for F_ENO stratified by sex, smoking, atopy, rhinitis current wheeze and asthma. * not all Study members underwent skin testing

Male, n = 471

15.3 (14.3,16.3)

Female, n = 424

11.6 (11.0, 12.4)

Current smoker (smoked on the day of testing)

Current smoker (not smoked on the day of testing)

Ex-smoker or non-smoker

Current smoker (smoked on the day of testing)

Current smoker (not smoked on the day of testing)

Ex-smoker or non smoker

n = 133

8.8

(7.9, 9.7)

n = 102

16.6

(14.7, 18.9)

n = 236

20.2

(18.6, 21.9)

n = 102

7.4

(6.7, 8.2)

n = 58

12.3

(10.2, 14.7)

n = 264

13.7

(12.8, 14.7)

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

n = 68

9.9

(8.6,11.5)

n = 62

7.6

(6.7, 8.7)

n = 61

19.8

(16.6, 23.6)

n = 41

12.9

(11.1, 14.9)

n = 141

24.8

(22.2, 27.7)

n = 92

14.9

(13.6, 16.3

n = 32

9.5

(7.8, 11.5)

n = 69

6.7

(5.9, 7.5)

n = 35

14.0

(10.6, 18.5)

n = 23

10.0

(8.2, 12.2)

n = 149

15.9

(14.4, 17.6)

n 114

11.2

(10.3, 12.2)

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

n = 50

9.2

(8.0, 10.7)

n = 83

8.5

(7.4, 9.7)

n = 30

21.0

(16.0, 27.5)

n = 72

15.1

(13.2, 17.4)

n = 97

24.0

(21.2, 27.2)

n = 139

17.9

(16.1, 19.9)

n = 33

9.0

(7.5,10.9)

n = 69

6.8

(6.0, 7.7)

n = 23

13.4

(10.1, 17.8)

n = 35

11.6

(9.0, 14.9)

n = 116

16.1

(14.3, 18.0)

n = 148

12.1

(11.1, 13.1)

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

n = 49

8.4

(6.9, 10.2)

n = 84

9.0

(8.0, 10.0)

n = 35

17.7

(13.4, 23.3)

n = 67

16.1

(14.1, 18.5)

n = 53

28.4

(23.0, 34.9)

n = 183

18.3

(16.9, 19.9)

n = 41

7.6

(6.4, 9.1)

n = 61

7.3

(6.4, 8.4)

n = 18

15.2

(9.4, 24.3)

n = 40

11.1

(9.3, 13.3)

n = 57

16.8

(14.2, 19.8)

n = 207

12.9

(12.0, 13.9)

n = 8

8.0

(4.1, 15.6)

Nil

n = 5

24.0

(12.7, 45.5)

n = 1

72.9

n = 17

27.5

(19.6, 38.7)

n = 2

28.5

(NA)

n = 3

8.8

(2.0, 40.0)

n = 4

9.4

(1.9, 45.2)

n = 3

32.4

(9.3, 112.0)

Nil

n = 13

17.3

(13.1, 22.8)

n = 3

17.8

(3.3, 96.9)

n = 41

8.5

(6.9, 10.4)

n = 84

9.0

(8.0, 10.0)

n = 30

12.3

(16.8, 22.9)

n = 66

15.8

(13.8, 17.9)

n = 36

28.8

(21.9, 37.8)

n = 181

18.2

(16.8, 19.8)

n = 38

7.5

(6.2, 9.1)

n = 57

7.2

(6.4, 8.2)

n = 15

13.0

(7.7, 22.1)

n = 40

11.1

(9.3, 13.1)

n = 44

16.7

(13.6, 20.5)

n = 204

12.9

(11.9, 13.9)

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

n = 21

9.8

(6.9, 14.0)

n = 112

8.6

(7.7, 9.5)

n = 27

21.7

(16.5, 28.5)

n = 75

15.1

(13.2, 17.4)

n = 39

29.7

(23.7, 37.2)

n = 197

18.7

(17.2, 20.4)

n = 18

9.5

(6.5, 13.9)

n = 84

7.0

(6.4,7.8)

n = 10

28.0

(14.7, 53.3)

n = 48

10.3

(8.9, 12.0)

n = 41

15.7

(12.7, 19.5)

n = 223

13.3

(12.4, 14.3)

n = 8

8.0

(4.1, 15.6)

Nil

n = 6

28.9

(14.7, 57.0)

Nil

n = 18

26.5

(19.1, 36.8)

n = 1

58.3

n = 5

11.0

(3.8, 32.2)

n = 2

5.7

(0.5, 72.1)

n = 3

32.4

(9.3, 112.0)

Nil

n = 14

18.3

(13.8, 24.3)

n = 2

12.0

(3.1, 47.4)

n = 13

11.2

(7.1, 17.8)

n = 112

8.6

(7.7, 9.5)

n = 21

20.0

(14.6, 27.4)

n = 75

15.1

(13.2, 17.4)

n = 21

32.7

(23.5, 45.6)

n = 196

18.6

(17.1, 20.2)

n = 13

9.0

(5.8, 14.2)

n = 82

7.1

(6.4, 7.8)

n = 7

26.4

(9.9, 69.9)

n = 48

10.3

(8.9, 12.0)

n = 27

14.6

(10.8, 19.5)

n = 221

13.3

(12.4, 14.4)