Table 1.

Age and sex distribution of Toxoplasma gondii seroprevalence in Bai and Han ethnic groups, Yunnan Province, southwestern China

Nationality	Age (years)	Male			Female			Total
		No. examined	No. positive	Prevalence, %	No. examined	No. positive	Prevalence, %	No. examined	No. positive	Prevalence, %
Han ethnicity	<18	17	0	0	11	0	0	28	0	0
	18–40	71	3	4·2	179	14	7·8	250	17	6·8
	41–65	65	10	15·4	120	21	17·5	185	31	16·8
	>65	72	10	13·9	60	11	18·3	132	21	15·9
	Subtotal	225	23	10·2*	370	46	12·4†	595	69	11·6‡
Bai ethnicity	<18	7	0	0	4	0	0	11	0	0
	18–40	102	44	43·1	109	28	25·7	211	72	34·1
	41–65	116	44	37·9	123	35	28·5	239	79	33·1
	>65	34	10	29·4	60	18	30	94	28	29·8
	Subtotal	259	98	37·8*	296	81	27·4†	555	179	32·3‡
Total		484	121	25	666	127	19·1	1150	248	21·6

OR, Odds ratio; CI, confidence interval.

P was estimated using the χ² test.

^*P < 0·001, OR 5·346, 95% CI 3·25–8·8.

^†P < 0·001, OR 2·654, 95% CI 1·777–3·962.

^‡P < 0·001, OR 3·629, 95% CI 2·668–4·936.