Table 1
- A farm-level study of risk factors associated with the colonization of broiler flocks with Campylobacter spp. in Iceland, 2001 – 2004

*Farm-level categorical variables available for analysis of Campylobacter* colonization of broilers in Iceland (n = 28^a)**
Variable	Description of variable	Number of farms

Manure spread on fields in summer season^b	Yes	11
	No	17
Manure spread on fields in winter season^b	Yes	9
	No	19
Manure stored on farm at any time of year	Yes	10
	No	18
Other domestic livestock on farm	Yes	9
	No	19
Other commercial poultry on farm	Yes	10
	No	18
Farm has all-in-all-out policy	Yes	18
	No	10
Farm water source	Non-official	17
	Non-official treated	4
	Official	4
	Official treated	3

^aOnly farms with complete data for all variables are included ^bVariables are highly correlated (τ_b≥ 0.8)

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