Seroprevalence and associated risk factors of Toxoplasma gondii infection in yaks (Bos grunniens) on the Qinghai–Tibetan Plateau of China

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Table 4

Seroprevalence of T. gondii infection by age in yaks on the Qinghai–Tibetan Plateau in 2018 and 2019.

Ages	Qinghai						Tibet						Qinghai and Tibet
	2018		2019		Subtotal		2018		2019		Subtotal		2018		2019		Subtotal
	Positive rates % (No. positive/No. samples)	95% CI	Positive rates % (No. positive/No. samples)	95% CI	Positive rates % (No. positive/No. samples)	95% CI	Positive rates % (No. positive/No. samples)	95% CI	Positive rates % (No. positive/No. samples)	95% CI	Positive rates % (No. positive/No. samples)	95% CI	Positive rates % (No. positive /No. sample)	95% CI	Positive rates % (No. positive /No. sample)	95% CI	Positive rates % (No. positive /No. sample)	95% CI
0＜year≤1	6.61(8/121)^bc	2.9–12.6	2.99(4/134)^c	0.8–7.5	4.71(12/255)^b	2.5–8.1	5.00(1/20)^a	0.1–24.9	27.27(3/11)^a	6.0–61.0	12.90(4/31)^a	3.6–29.8	6.38(9/141)^a	3.0–11.8	4.83(7/145)^c	2.0–9.7	5.59(16/286)^b	3.2–8.9
1＜year≤3	7.76(9/116)^bc	3.6–14.2	7.76(17/219)^bc	4.6–12.1	7.76(26/335)^b	5.1–11.2	9.59(14/146)^a	5.3–15.6	11.76(26/221)^a	7.8–16.8	10.90(40/367)^a	7.9–14.5	8.78(23/262)^a	5.7–12.9	9.77(43/440)^abc	7.2–12.9	9.40(66/702)^a	7.4–11.8
3＜year≤5	3.42(4/117)^c	0.9–8.5	8.61(13/151)^b	4.7–14.3	6.34(17/268)^b	3.7–10.0	7.98(19/238)^a	4.9–12.2	9.55(30/314)^a	6.54–13.4	8.88(49/552)^a	6.6–11.6	6.48(23/355)^a	4.2–9.6	9.25(43/465)^bc	6.8–12.3	8.05(66/820)^ab	6.3–10.1
5＜year≤7	17.78(16/90)^a	10.5–27.3	18.03(11/61)^a	9.4–30.0	17.88(27/151)^a	12.1–24.9	6.81(19/279)^a	4.2–10.4	12.66(39/308)^a	9.2–16.9	9.88(58/587)^a	7.6–12.6	9.49(35/369)^a	6.7–12.9	13.55(50/369)^a	10.2–17.5	11.52(85/738)^a	9.3–14.0
year＞7	12.12(4/33)^ab	3.4–28.2	15.25(9/59)^ab	7.2–27.0	14.13(13/92)^a	4.7–14.3	12.33(9/73)^a	5.8–22.1	8.22(6/73)^a	3.1–17.0	10.27(15/146)^a	5.9–16.4	12.26(13/106)^a	6.7–20.0	11.36(15/132)^ab	6.5–18.1	11.76(28/238)^a	8.0–16.6
Total	8.60(41/477)	6.2–11.5	8.65(54/624)	6.6–11.1	8.63(95/1101)	7.0–10.5	8.20(62/756)	6.4–10.4	11.22(103/927)	9.3–13.4	9.86(166/1683)	8.5–11.4	8.35(103/1233)	6.9–10.0	10.19(158/1551)	8.7–11.8	9.38(261/2784)	8.3–10.5

Note: The same lowercase letters within columns represent no significant differences between groups (p > 0.05) and different lowercase letters within columns represent significant differences between groups (p < 0.05).

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