Table 3. Univariate and multivariate analysis of factors associated with Giardia duodenalis.

Parameter	n	G. duodenalis positive (%)	OR	95%CI	P	aOR a	95%CI	P
Subgroup
Community	492	65.2	1
Health facility	91	46.4	0.46	0.29–0.73	0.001	0.46	0.27–0.78	0.004
Age (years)
<1	61	32.7	1
1<2	141	48.9	1.97	1.08–3.59	0.03	1.66	0.90–3.04	0.10
2<3	144	64.9	3.82	2.06–7.07	<0.0001	2.72	1.41–5.26	0.003
3<4	124	68.7	4.52	2.65–7.72	<0.0001	2.55	1.19–5.45	0.02
4<5	113	72.8	5.52	3.15–9.70	<0.0001	3.34	1.47–7.50	0.004
Breastfed
No	284	71.5	1
Yes	298	50.2	0.40	0.32–0.51	<0.0001	0.62	0.40–0.97	0.04
No. of siblings
None	134	52.4	1
1–3	406	61.6	1.45	0.99–2.12	0.05	1.15	0.74–1.80	0.54
≥4	42	77.6	3.14	1.87–5.27	0.0001	2.47	1.19–5.12	0.02

OR, odds ratio; 95%CI, 95% confidence interval, aOR ^a, adjusted odds ratio, adjusted for all other factors shown in table and taking into account cluster effects (n = 576; R² = 0.24).