Variables Normal lung function (n) Abnormal lung function (n) χ2 P
Sex 2.001 0.157
Male 285 34
Female 153 11
Obesity 1.678 0.195
Yes 125 17
No 313 28
Inhaled allergen-specific IgE in serum 1.853 0.173
Positive 141 19
Negative 297 26
Number of eosinophils in peripheral blood 0.798 0.372
Abnormal 17 3
Normal 421 42
History of chronic cough 53.504 <0.001
Yes 81 30
No 357 15
History of wheezing 40.136 <0.001
Yes 60 23
No 378 22
History of familial allergic diseases 4.073 0.044
Yes 166 24
No 272 21
History of personal allergic diseases 0.147 0.702
Yes 240 26
No 198 19
Asthma 197.700 <0.001
Yes 16 31
No 422 14
Allergic rhinitis 0.205 0.651
Yes 85 10
No 353 35