POSTN and gastroesophageal reflux disease: A statistically significant difference was found only in periostin values, which were significantly higher in sensitized children (evaluated only by asIgE) with GERD (7.61 ± 4.11 pg/mL) compared to non- sensitized children with GERD (5.34 ± 1.72 pg/mL) (p = 0.002).