Body mass index and serum periostin
In according with the previous adulthood studies (21, 22), we found a negative correlation between serum periostin levels and body mass index in children with asthma along with healthy controls. In our previous studies, we have demonstrated associations between anthropometric measures and asthma severity along with pulmonary functions (23-25). In the current study, our results did not reveal an independent association between body mass index and asthma severity. The different study design and the lack of controls group with obese children is the most plausible explanation. Addition of serum periostin measurement into the studies can help us to better understand the interaction between obesity and asthma in the future.