POSTN and asthma: In contrast, the protein levels of POSTN were higher in the total NA group (18,679.59 ± 8,086.07 pg/ml), as well as in the severe (20,198.91 ± 7,859.24 pg/ml) and, in the moderate–mild NA patients (17,160.28 ± 7,930.59 pg/ml) compared to the C group (15,487.71 ± 6,532.85 pg/ml), but only in the severe asthma patients were the differences statistically significant.