Table 2 Univariate analysis: correlations between each asthma symptom and independent variables (n = 505).

	Cough intensity		Airway Secretion intensity		Chest tightness intensity		Dyspnea intensity		Wheezing intensity
	Coefficient correlation (rs)	P-value	Coefficient correlation (rs)	P-value	Coefficient correlation (rs)	P-value	Coefficient correlation (rs)	P-value	Coefficient correlation (rs)	P-value
Age (years)	0.080	0.0742	0.046	0.3028	− 0.15***	0.0007	0.00058	0.9896	− 0.12**	0.0095
BMI (kg/m²)	0.046	0.3047	− 0.00089	0.9841	0.034	0.4437	0.17***	0.0001	0.14**	0.0022
FeNO (ppb)	− 0.18****	< 0.0001	− 0.074	0.0984	− 0.13**	0.0048	− 0.15***	0.0006	− 0.051	0.2564
FEV₁ (% pred.)	− 0.14**	0.0011	− 0.078	0.0819	− 0.14**	0.0019	− 0.26****	< 0.0001	− 0.26****	< 0.0001
FEV₁/FVC (%)	− 0.033	0.4579	− 0.015	0.7442	0.018	0.6883	− 0.019	0.6636	− 0.077	0.0820
Sputum neutrophils (10³/g)	0.0054	0.9047	0.086	0.0575	− 0.027	0.5599	− 0.034	0.4491	− 0.042	0.3596
Sputum eosinophils (10³/g)	− 0.0044	0.9229	0.071	0.1157	− 0.072	0.1150	− 0.11*	0.0115	0.047	0.2970
Sputum neutrophils (%)	0.041	0.3635	0.0058	0.8960	0.0032	0.9425	0.032	0.4788	− 0.085	0.0561
Sputum eosinophils (%)	− 0.0086	0.8474	0.038	0.3945	− 0.050	0.2644	− 0.071	0.1134	0.064	0.1516
Blood neutrophils (µL)	0.11*	0.0118	0.079	0.0778	0.059	0.1870	0.13**	0.0043	0.12**	0.0083
Blood eosinophils (µL)	0.079	0.0765	0.14**	0.0023	− 0.029	0.5192	− 0.021	0.6395	0.079	0.0762
Fibrinogen (g/L)	0.12**	0.0060	0.082	0.0680	0.024	0.5896	0.10*	0.0231	0.056	0.2191
CRP (mg/L)	0.10*	0.0245	0.079	0.0792	0.075	0.0958	0.18****	< 0.0001	0.12**	0.0074
Total IgE (KU/L)	− 0.085	0.0564	0.014	0.7588	− 0.023	0.6124	− 0.11*	0.0169	0.036	0.4218

*Significant at the p < 0.05 level; **Significant at the p <0.01 level; ***Significant at the p <0.001 level; ****Significant at the p <0.0001 level.

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