TABLE 5.

Incidence of Entamoeba histolytica diarrheal episodes in children with and without prior stool anti-CRD IgA^a

No. of previous diarrheal ep.b	Previous stool anti-CRD IgA	Person-time (days)	No. of diarrheal episodes	Incidencec	Adjusted relative hazard	95% CI	P value
0	Negative	46,214	22	0.05
0	Positive	242,231	17	0.007	0.16	0.08, 0.30	<0.0001
1	Negative	6,522	12	0.18	3.66	1.62, 8.24	0.002
1	Positive	14,840	3	0.02	0.48	0.14, 1.66	0.25
≥2	Negative	5,886	17	0.29	7.07	3.50, 14.29	<0.0001
≥2	Positive	5,938	2	0.03	0.75	0.20, 2.83	0.68

^aIncidence of Entamoeba histolytica-associated diarrheal episodes and adjusted relative risk for repeat diarrheal episodes were calculated using the Andersen-Gill proportional hazards method adjusted for age in months, gender, baseline IgG, and area of residence within Mirpur. Siblings (n = 36) were excluded from this analysis. See Table 3 for definition of person-time.

^bep., episodes.

^cNo. of diarrheal episodes per 100 child-days.