IL13 and pulmonary arterial hypertension: There was no difference in the median value of IL-13 in the group with Sch-PAH (152.3 [IR: 103.7 - 177.8]) pg/ml, compared to patients without PAH (131.8 [IR: 100.2 - 162.5]) pg/ml (p = 0.177) (Table 2).