Table 1:

Mean concentration (ug/L) of heavy metals in serum samples of control and RA patients (n=200)

Metals	Studied Group	Mean ±SD	S.E	Comparison of Significance
				t-test	P-value
Pb	Control	2.1904±1.1433	0.08084	11.477	0.000**
	RA	5.7333±4.318	0.30533
Cd	Control	0.2845±0.75959	0.05371	19.278	0.000**
	RA	1.767± 0.7981	0.05644
Cr	Control	0.2601±0.1751	0.01238	18.92	0.000**
	RA	3.0817±2.119	0.14985
Ni	Control	112.53±11.067	0.78256	−35.619	0.000**
	RA	41.19±27.27	1.92