Table 1.

Socio-demographic characteristics of the study populations and seroprevalence of T. gondii infection.

	Fruit and vegetable workers (n = 200)					Controls (n = 400)					All (n = 600)
			Prevalence of					Prevalence of					Prevalence of
			T. gondii infection		P			T. gondii infection		P			T. gondii infection		P
Characteristic	No.	%	No.	%	value	No.	%	No.	%	value	No.	%	No.	%	value
Age groups (years)
30 or less	74	37.0	4	5.4	0.06	148	37	10	6.8	0.001	222	37.0	14	6.3	0.0004
31-50	60	30.0	2	3.3		120	30	3	2.5		180	30.0	5	2.8
51-70	41	20.5	7	17.1		84	21	8	9.5		125	20.8	15	12
> 70	25	12.5	2	8.0		48	12	10	20.8		73	12.2	12	16.4
Gender
Male	155	77.5	12	7.7	1.00	310	77.5	27	8.7	0.26	465	77.5	39	8.4	0.29
Female	45	22.5	3	6.7		90	22.5	4	4.4		135	22.5	7	5.2
Birth place
Durango State	165	90.2	10	6.1	0.33	351	88.4	25	7.1	0.32	516	89.0	35	6.8	0.22
Other Mexican states	18	9.8	2	11.1		45	11.3	6	13.3		63	10.9	8	12.7
Abroad	-					1	0.3	0	0.0		1	0.2	0	0
Residence place
Durango State	198	99.0	15	7.6	1.00	391	98.5	30	7.7	0.56	589	98.7	45	7.6	0.77
Other Mexican states	2	1.0	0	0.0		5	1.3	1	20.0		7	1.2	1	14.3
Abroad	-					1	0.3	0			1	0.2	0	0
Residence area
Urban	132	67.3	9	6.8	0.42	300	77.5	23	7.7	0.88	432	74.1	32	7.4	0.56
Suburban	9	4.6	0	0.0		24	6.2	2	8.3		33	5.7	2	6.1
Rural	55	28.1	6	10.9		63	16.3	6	9.5		118	20.2	12	10.2
Educational level
No education	15	7.5	2	13.3	0.56	16	4	3	18.8	0.22	31	5.2	5	16.1	0.20
1-6 years	100	50.0	9	9.0		104	26.2	8	7.7		204	34.2	17	8.3
7-12 years	66	33.0	3	4.5		141	35.5	13	9.2		207	34.7	16	7.7
> 12 years	19	9.5	1	5.3		136	34.3	7	5.1		155	26.0	8	5.2
Socio-economic level
Low	83	44.1	6	7.2	1.00	124	31.7	10	8.1	1.00	207	35.8	16	7.7	0.89
Medium	105	55.9	8	7.6		267	68.3	21	7.9		372	64.2	29	7.8