TABLE 1.

Comparison of numbers of cells positive for activation antigens between OA and RA

Antigen	Median no. of cells per HPF (range)		Pa
	OA	RA
CD3	27.35 (0–831)	92.3 (32.7–472.2)	0.01
CD45RO	30.4 (1.8–662.2)	147.6 (26–410.5)	0.008
CD69	7.7 (0–614.4)	48.9 (0–212.9)	0.01
CD25	2.2 (0–220.5)	18.4 (4–73)	0.004
HLA class II	59.7 (0–980.2)	152.9 (77–433.6)	0.005
CD38	6.2 (0–478.3)	40 (12.8–124.8)	0.003
CD43	22.2 (0–235.1)	91.7 (27.4–402.4)	0.003

^aBy Mann-Whitney test.