Table 2—

Spearman's rank correlations (ρ) of clinical and inflammatory parameters with provocative concentration causing a 20% fall in forced expiratory volume in one second (PC₂₀) of methacholine (Mch) and PC₂₀ of adenosine-5'-monophosphate (AMP)

	PC₂₀ Mch		PC₂₀ AMP
	ρ	p-value	ρ	p-value
Subjects n	30		29
Age	−0.36	0.052	−0.30	0.12
Sex	0.016	0.93	0.089	0.65
Pack yrs	−0.097	0.61	−0.19	0.34
Cigarettes·day⁻¹	0.26	0.17	0.28	0.14
FEV₁ % pred	0.75	0.00	0.58	0.001
FEV₁/VC %	0.82	0.00	0.87	0.00
sG_aw 1·kPa⁻¹·s⁻¹	0.70	0.00	0.69	0.00
Sputum 10³·mL⁻¹
Cell concentration	0.086	0.65	0.080	0.68
Eosinophils	−0.32	0.085	−0.21	0.28
Neutrophils	0.009	0.96	−0.032	0.87
Macrophages	0.26	0.16	0.23	0.22
Lymphocytes	−0.071	0.71	−0.06	0.75
Epithelial cells	−0.25	0.18	−0.18	0.36

FEV₁: forced expiratory volume in one second
VC: vital capacity
sG_aw: airway conductance