Table 2.

Summary statistics for immunoconversions and associations with gastrointestinal symptoms by immunoconversion definition from univariate GEE models

Pathogen	Immunoconversion definition ^a	Total N of immunoconversions	N / % of immunoconversions with symptoms ^b	% of episodes of symptoms with immunoconversion	Unadjusted OR of immunoconversion after an episode of symptoms
Cryptosporidium	1	63	7 / 11.1%	3.3%	3.07 (1.42; 6.63)^*
	2	43	5 / 11.6%	2.3%	3.20 (1.30; 7.87)^*
	3	32	4 / 12.5%	1.9%	3.46 (1.23; 9.75)^*
GI norovirus	1	182	8 / 4.4%	14.5%	3.77 (1.02; 14.0)^*
	2	125	6 / 4.8%	10.9%	3.80 (0.74; 19.6)
	3	102	4 / 3.9%	7.3%	2.67 (0.29; 25.0)
GII noroviruses	1	177	7 / 4.0%	12.7%	3.42 (1.21; 9.64)^*
	2	112	7 / 6.3%	12.7%	5.25 (1.76; 15.7)^*
	3	72	3 / 4.2%	5.5%	3.58 (0.73; 17.6)
All noroviruses	1	294	13 / 4.4%	23.6%	4.26 (1.74; 10.5)^*
	2	210	13 / 6.2%	23.6%	6.15 (2.42; 15.6)^*
	3	155	7 / 4.5%	12.7%	3.88 (0.99; 15.2)

Immunoconversion definitions: (1) Four-fold increase in antibody response between monthly samples; (2) same as in 1 and post-conversion responses above the 80 % prediction bound of spline regression on age; (3) same as in 1 and post-conversion responses above the 90 % prediction bound of spline regression on age.

Symptoms definitions: gastroenteritis (diarrhea or vomiting or abdominal cramps) for Cryptosporidium, combined diarrhea and vomiting symptoms for noroviruses.

p < 0.05