Table 3.

Spearman's correlation coefficients among study participants

	Serum periostin level (ng/mL)		YKL-40 level (IU/mL)
	R	P-value	r	P-value
Z FEV1	−0.068	0.571	−0.262	0.023
FEV1/FVC ratio	−0.038	0.754	−0.031	0.789
Postbronchodilator ΔFEV1 (pred %)	−0.284	0.015	−0.211	0.043
Methacholine PC20	−0.281	0.022	−0.294	0.017
Post-exercise maximum decrease in FEV1 (%)	0.358	0.022	0.215	0.102
PB eosinophils (/ml)	0.265	0.026	0.065	0.622
FeNO (ppb)	0.484	<0.001	0.118	0.336
Total IgE (IU/ml)	0.229	0.147	0.277	0.119