CHI3L1 and asthma: There were no differences in serum concentrations of YKL-40 across the entire group of patients with asthma and controls median (min–max) 40 μg/L (10–280 μg/L) versus 43 μg/L (14–195 μg/L), p=0.106, nor between patients with asthma and asthma with rhinitis, or between patients with rhinitis and controls (Table 1).