Table 1. Demographics of the study population

N

26

29

12

17

Gender (M/F)

9/17

13/16

6/6

7/10

p > 0.4

p > 0.6

Age (yr)

37 ± 11

31 ± 11

31 ± 9

31 ± 12

p < 0.05^f

p > 0.9

Race (B/W/H/O)^a

12/7/4/3

15/5/7/2

8/1/2/1

7/4/5/1

p > 0.9

p > 0.7

Body mass index

26 ± 4

28 ± 5

29 ± 5

27 ± 5

p < 0.04

p > 0.2

Asthma severity (mild/moderate/severe)^b

–

15/10/4

7/3/2

8/7/2

–

p > 0.8

IgE (IU/ml)

39 ± 38

627 ± 897

66 ± 32

1023 ± 1002

p < 0.002

p < 0.003

Absolute eosinophils (× 10³/μl)

0.2 ± 0.1

0.5 ± 0.4

0.2 ± 0.1

0.8 ± 0.3

p < 10^–4

p < 10^–4

Inhaled corticosteroids (on/not on)

–

9/20

3/9

6/11

–

p > 0.8

Pulmonary function parameters^c

 FVC

112 ± 12

104 ± 16

103 ± 18

104 ± 15

p < 0.03

p > 0.9

 FEV1

109 ± 11

87 ± 13

89 ± 12

85 ± 14

p < 10^–8

p > 0.2

 % change FEV1 post-bronchodilator

2.6 ± 2.8

11.4 ± 5.0

10.6 ± 2.7

11.9 ± 5.9

p < 10^–4

p > 0.5

 FEV1/FVC

81 ± 4

71 ± 9

73 ± 7

69 ± 11

p < 10^–5

p > 0.2

 TLC

103 ± 16

103 ± 18

99 ± 18

105 ± 17

p > 0.9

p > 0.3

 DLCO

92 ± 10

88 ± 11

89 ± 10

87 ± 11

p > 0.2

p > 0.3