highly significantP = 0.0002
Analysis of IL-18 (mean [min/max]: 2,385 [300–8,025] pg/ml) and ECP (mean: 1,509 [<100/4,625] ng/ml) in 23 paired samples showed a highly significant correlation (r s = 0.70, P = 0.0002) between this cytokine and the eosinophil-derived product in the airways.