Table 2.

Multivariable logistic regression analysis of risk factors for Salmonella in 40 broiler flocks from Shiraz, southern Iran

Attribute	Wald	Standard error	p-value	Odds ratio
Trimethoprim sulfonamides
Yes	7.60	1.36	0.006	43.10
No *	-	-	-	1.00
Age (day)	8.70	0.02	0.003	0.93
Infectious bronchitis vaccine
Yes	3.10	1.25	0.080	8.90
No*	-	-	-	1.00

^* Reference category.