TABLE 1.

Pearson's correlation coefficients for samples from individuals seropositive for Chagas' disease^a

Parameter	Pearson's correlation coefficientb
	MPO activity	MPO content	AOPP content	3NT content	XOD activity	Nitrite level
MPO activity	1	0.588**	0.064	0.266**	0.071	0.043
MPO content	0.588**	1	0.264*	0.317**	−0.002	−0.003
AOPP content	0.064	0.254*	1	0.055	0.027	−0.017
3NT content	0.266**	0.317**	0.055	1	0.137	0.152
XOD activity	0.171	−0.002	0.027	0.137	1	0.105
Nitrite level	0.043	−0.003	−0.017	0.152	0.071	1

^aPearson's correlation analysis was performed for seropositive and seronegative subjects (n = 121 in each group). The plasma level of MPO activity (nmol H₂O₂/mg protein/min) was positively correlated with MPO protein content (pmol MPO/mg plasma protein) and AOPP content (μmol chloramine-T/ml plasma) for seropositive subjects. The plasma levels of MPO activity and MPO protein contents of seropositive subjects were also positively correlated with 3NT contents (nmol 3NT/mg plasma protein). The XOD activity (μmol uric acid formed/mg protein) and nitrite level (μmol nitrite/mg protein) were not significantly correlated with any of the parameters.

^b*, P < 0.05; **, P < 0.01.