Seroprevalence and Risk Factors of Bluetongue Virus Infection in Tibetan Sheep and Yaks in Tibetan Plateau, China

Table 2

Odds ratios of the risk factors for bluetongue virus (BTV) seroprevalence in Tibetan sheep and yaks ().

Factor	Group	Prevalence (%)	OR	95% CI	value
					Univariable analysis	Multivariable analysis
Breed	Yak	13.3	Reference			Reference
	Tibetan sheep	20.3	1.653	1.383–1.976	<0.0001	<0.0001
Season (in yaks)	Winter	9.0	Reference			Reference
	Spring	12.6	1.468	0.916–2.352	0.0293	0.1088
	Summer	15.5	1.870	1.166–3.000		0.0086
	Autumn	15.4	1.853	1.180–2.910		0.0067