Table 1.

Plasma osteopontin levels in head and neck cancer and cervix cancer patients as measured using two different ELISA systems.

patient group		assay A	assay B	individual factors (assay B/A)
		osteopontin (ng/ml)	osteopontin (ng/ml)
all samples	mean ± SD	13.9 ± 21.0	786.0 ± 442.5	77.1 ± 41.4
(n = 88)	median (range)	9.8 (3.5–189.5)	667.0 (148.8–2095.0)	74.6 (2.0–217.9)
head and neck cancer	mean ± SD	16.1 ± 31.1	794.3 ± 467.2	76.3 ± 38.9
(n = 34)	median (range)	10.4 (3.8–189.5)	650.2 (148.8–1841.0)	76.5 (5.7–184.5)
cervix cancer	mean ± SD	12.4 ± 11.0	780.7 ± 430.6	77.6 ± 43.3
(n = 54)	median (range)	9.5 (3.5–80.5)	667.0 (155.5–2095.0)	70.3 (2.0–217.9)