TABLE 1.

Prevalence and magnitude of anti-MSP4 antibodies^a

Target antigen	Cut-off ODb	Positive proportionc (%)	OD valuesd
			Min	Max	Median	LQ	UQ
EcMSP4-His	0.072	82.2	−0.012	2.325	0.316	0.107	0.715
ScMSP4-His	0.014	93.9	−0.004	2.397	0.294	0.091	0.745

^aA total of 342 serum samples collected from the Vietnam residents were tested by ELISA; 

^bThe cut-off OD values are calculated as the mean + 3 standard deviations for the ODs of 30 control sera from nonimmune individuals; 

^cThe positive sera are defined as those that give an OD value greater than the cut-off OD. 

^dOD values are shown as minimum (Min), maximum (Max), median, and lower (LQ) and upper (UQ) quartiles.