TABLE 3.

Relative risk of diarrhea from Giardia intestinalis, by age in months, for children living in Las Pampas de San Juan, Lima, Peru, between 1995 and 1998, with and without adjustment for gender, season, nutritional status, and breastfeeding status^*

Age (months)	No. of child-weeks		Crude relative risk	Adjusted relative risk	95% confidence interval
	G+D+/G+ (n = 235/3,911)	G−D+/G− (n = 1,055/16,973)
0–5	10/188	157/4,404	1.57	1.56	0.7, 3.3
6–11	25/402	319/4,321	0.88	0.86	0.6, 1.2
12–17	70/762	298/3,291	1.01	1.02	0.8, 1.4
18–23	49/901	146/2,289	0.84	1.00	0.7, 1.4
24–35	81/1,658	135/2,668	1.00	0.94	0.7, 1.4

^*The risk of developing Giardia-associated diarrhea was calculated by dividing the number of Giardia-positive and diarrhea-positive (G+D+) child-weeks by the number of Giardia-positive (G+) child-weeks. The risk of developing diarrhea due to other causes was calculated by dividing the number of Giardia-negative and diarrhea-positive (G−D+) child-weeks by the number of Giardia-negative (G−) child-weeks.