Table 2. Relative optical density (OD) for sOPN bands and OD-based concentration of sOPN in sputum.

Sputum	sOPN (µg/ml)	Relative OD	Relative OD	Relative OD	p-value
	All subjects (N = 33)	All subjects (N = 47)	Non-asthmatic Subjects (N = 27)	Asthmatic Subjects (N = 20)
Polymeric sOPN (≥90 kD) (%)	2.45±2.97	94.2±5.8	96.4±3.2	91.6±1.6	0.009
	1.59 [0.58, 2.67]	94.6 [92.7, 98.7]	96.5 [94.6, 99.4]	94.0 [89.0, 97.5]
Monomeric sOPN (50–55 kD) (%)	0.28±0.47	3.2±3.3	2.0±1.8	4.5±4.1	0.025
	0.08 [0.00, 0.37]	2.6 [0.7, 4.4]	1.9 [0.0, 2.9]	3.8 [1.6, 6.2]
Cleaved sOPN (25 kD) (%)	0.10±0.15	1.0±1.3	0.7±1.1	1.4±1.5	0.064
	0.08 [0.00, 0.08]	0.5 [0.0, 1.5]	0.3 [0.0, 0.9]	1.2 [0.3, 1.6]
Cleaved sOPN (17 kD) (%)	0.11±0.17	1.7±1.9	0.9±1.4	2.6±2.0	0.005
	0.03 [0.01, 0.13]	0.9 [0.3, 2.7]	0.6 [0.0, 1.0]	2.7 [0.6, 4.1]

Values are expressed as mean ± SD and median [interquartile range]. Total concentration of sOPN was 3.03±3.41(2.25 [0.80, 3.08]) µg/ml in sputum samples. P-values are for comparisons (Mann-Whitney test) of relative OD of various bands between healthy and asthmatic subjects. Significant p-values are shown in bold.