. Author manuscript; available in PMC: 2016 Aug 1.

Published in final edited form as: Zoonoses Public Health. 2014 Sep 18;62(5):375–380. doi: 10.1111/zph.12157

Table 2.

Results of a multivariable logistic regression model testing the odds of a NTS positive result from environmental swabs of hatchling boxes arriving at a farm store chain. The significance of box characteristics was evaluated while controlling for ‘Source’ as a fixed effect

Variable	Category	Salmonella result pos/total (%)	Odds ratio (95% CI)
Source	Hatchery A	28/86 (33%)	7.72 (0.98–61.21)
	Hatchery B	6/33 (18%)	3.56 (0.39–32.26)
	Hatchery C	3/17 (18%)	3.43 (0.32–36.83)
	Other	1/17 (6%)	Ref
Number of hatchlings in box	≥100	21/67 (31%)	1.83 (0.6–5.59)
	75	8/46 (17%)	1.01 (0.31–3.31)
	50	16/42 (38%)	2.84 (0.92–8.74)
	25	13/57 (23%)	Ref
At least one dead hatchling in the box	Yes	4/13 (31%)	0.95 (0.34–2.65)
At least one dead hatchling in the box	No	55/206 (27%)	Ref
At least one sick/injured hatchling in the box	Yes	12/46 (26%)	0.4 (0.05–3.48)
At least one sick/injured hatchling in the box	No	47/173 (27%)	Ref