. 2008 Jul 18;74(17):5444–5450. doi: 10.1128/AEM.02664-07

TABLE 2.

Yersinia pseudotuberculosis in conventionally and organically produced pigs at slaughterhouse level

Production type	Intestinal content				Tonsil				Pluck set				Carcass
	n	No. (%) pos.^b	95% CI^a		n	No. (%) pos.	95% CI		n	No. (%) pos.	95% CI		n	No. (%) pos.	95% CI
	n	No. (%) pos.^b	Random sampling^c	Clustering at farms^d	n	No. (%) pos.	Random sampling^c	Clustering at farms^d	n	No. (%) pos.	Random sampling^c	Clustering at farms^d	n	No. (%) pos.	Random sampling^c	Clustering at farms^d
Organic	119	11 (9)	5-16	2-31	119	28 (24)	17-33	4-62	120	5 (4)	1-9	0-24	120	10 (8)	4-15	1-37
Conventional (total)	239	13 (5)	3-9	0-28	231	6 (3)	1-6	1-9	234	1 (0.4)	0-2	0-3	239	0 (0)	0-2	NC^e
High capacity^f	121	13 (11)	6-19	0-49	117	4 (3)	1-9	0-18	119	0 (0)	0-3	NC	121	0 (0)	0-3	NC
Low capacity^g	118	0 (0)	0-3	NC	114	2 (2)	0-6	0-6	115	1 (1)	0-6	0-6	118	0 (0)	0-3	NC
Total	358	24 (7)	5-10	2-20	350	34 (10)	7-14	3-27	354	6 (2)	1-4	0-7	359	10 (3)	2-5	0-14

CI, confidence interval.

Pos., positive.

Ninety-five percent confidence interval of prevalence when sampling was assumed to be randomized (exact binomial estimates).

Ninety-five percent confidence interval of prevalence when the fact that 21 to 26 pigs were sampled from each farm was considered (Fleiss quadratic 95% confidence interval).

NC, could not be calculated.

Production capacity of 1,000 fattening pigs or more per year.

Production capacity of fewer than 1,000 fattening pigs per year.