Table 2.

Prevalence and risk factors of Echinococcus granulosus infection in Tibetan sheep on Qinghai–Tibet plateau.

Variable	Category	No. tested	No. positive	% (95% CI)	P-value	OR (95% CI)
Region	Sog County	273	69	25.3 (20.2–30.9)	0.004	1.86 (0.35–3.82)
	Nyainrong County	273	42	15.4 (11.3–20.2)	Reference
	Qinglong Township	171	93	54.4 (46.6–62.0)	<0.001	6.56 (5.10–7.24)
	Baingoin County	375	213	56.8 (51.6–61.9)	<0.001	7.23 (6.09–8.20)
Gender	Male	616	249	40.4 (36.5–44.4)	Reference
	Female	476	168	35.3 (31.0–39.8)	0.084	1.24 (0.97–1.59)
Age	0 < year ≤ 1	393	101	25.7 (21.4–30.3)	Reference
	1 < year ≤ 2	484	207	42.8 (38.3–47.3)	<0.001	2.16 (2.35–2.62)
	Year > 2	215	109	50.7 (43.8–57.6)	<0.001	2.97 (2.24–3.48)
Total		1,092	417	38.2 (35.3–41.1)