A prospective case–control and molecular epidemiological study of human cases of Shiga toxin-producing Escherichia coli in New Zealand

Table 2 Population attributable fractions (PAF in %) with 95% credible intervals (CrI in %) of identified risk factors

Variable	Cases (n)	Proportion of cases (p)	Adjusted odds ratio^a	PAF (95% CrI)^b
For children 0–4 years old: Other household member having contact with animals other than household pets
No	28	0.549	Ref	-
Yes	23	0.451	4.03	16.82 (9.0–23.7)
Cattle livestock present in meshblock
No	74	0.655	Ref	-
Yes	39	0.345	1.89	18.20 (0.6–29.4)
Contact with animal manure
No	66	0.660	Ref	-
Yes	34	0.340	2.09	17.47 (4.4–27.7)
Contact with recreational waters
No	97	0.866	Ref	-
Yes	15	0.134	2.95	9.41 (2.7–16.5)
Travelled to areas in NZ with interrupted or no main water supply
No	96	0.865	Ref	-
Yes	15	0.135	2.43	8.17 (0.7–15.7)
Water supply to home from private bore/spring/creek/or stream
No	89	0.802	Ref	-
Yes	22	0.198	1.85	9.46 (-2.5–18.8)

^aAdjusted odds ratios were derived from multivariate logistic regression analysis model using multiple imputations by chained equations (Table 1).
^bPAF and 95% CrI were computed based on 1000 simulations.
Ref = reference level for comparison.

ISSN: 1471-2334