TABLE 2.

Decline in H. pylori EIA ISR among samples that initially tested positive for H. pylori according to level of the initial ISR (n = 517)

All samples or samples grouped by indicated initial ISR	No. of samples	% With antibody not detected on repeated testa	% With indicated decline of ISR on repeated test
			≥30%b	≥40%c	≥50%d
All	517	3.1	6.0	3.3	1.9
3.36-8.70	176	0.6	6.8	4.0	2.3
2.27-3.35	171	0.6	4.1	1.8	0.6
1.10-2.26	170	8.2	7.1	4.1	2.9

^aP value for trend, <0.0001.

^bP value for trend, 0.94.

^cP value for trend, 0.95.

^dP value for trend, 0.66.