298 Relationship between Aeroallergen Sensitization and Asthma Severity in Mexican Children

value of FeNO, which was defined as the value of 95% in distribution curve, was same or less than 34 ppb. In a univariate analysis, FeNO levels were not associated with age, BMI and smoking history. However, atopy status (18.2 6 11.8 for atopy and 15.16 8.5 for nonatopy groups, P 1⁄4 0.008) and gender (17.8 6 10.2 for male and 14.8 6 9.8 for female groups, P , 0.001) were positively associated with FeNO levels. In stratified analysis, the significance of both variables remained unchanged (P , 0.001). Conclusions: Our data suggested that the reference value of FeNO in healthy Korean adults seemed to be same or less than 34 ppb. Reference values of FeNO in Korean adults are influenced by gender and atopy status. This study was supported by a grant of Korea HealthCare technology R&D project, Ministry of Health and Welfare, Republic of Korea (A092076).