Table 3.

Values of observed and simulated C score and number of unique seroconversions against selected viruses in 42 Spanish pig farms

Farm reference	C score		P value	Unique combinations		P value
	Observed	Expected	Observed > expected	Observed	Expected	Observed > expected
1	3·33	3·52	1	4·01	3·55	0·55
2	4·66	5·07	1	5·01	5·02	1
3	7·33	7·27	0·56	5·01	5·02	1
4	7·33	6·68	0·039*	5·01	6·86	1
5	3·01	3·01	1	4·01	4·01	1
6	5·01	5·01	1	4·01	4·01	1
7	4·01	4·01	1	3·01	3·01	1
8	8·01	8·31	1	5·01	5·01	1
9	2·02	2·02	1	4·01	4·01	1
10	5·33	5·33	1	4·01	4·01	1
11	7·33	7·66	0·55	6·01	6·56	0·97
12	1·66	1·67	1	3·01	3·01	1
13	4·01	3·76	1	4·01	5·46	1
14	2·66	2·71	0·57	4·01	4·01	1
15	2·16	2·38	1	5·01	4·58	0·58
16	1·33	1·33	1	5·01	5·02	1
17	2·33	2·33	1	4·01	4·01	1
18	2·33	2·32	0·43	5·01	5·56	1
19	7·66	7·42	0·43	8·01	6·61	0·078
20	2·16	2·33	1	5·01	5·01	1
21	1·01	1·01	1	4·01	4·01	1
22	1·16	1·28	1	5·01	4·51	0·51
23	10·01	10·11	0·62	9·01	8·43	0·51
24	8·66	7·62	2·01	5·01	5·73	0·99
25	3·01	3·01	1	4·01	4·01	1
26	12·01	10·53	0·5	5·01	5·69	1
27	3·01	3·51	1	7·01	6·21	0·29
28	3·66	3·65	0·61	7·01	6·78	0·68
29	1·33	1·51	1	6·01	5·58	0·58
30	1·01	1·01	1	5·01	5·02	1
31	4·66	4·66	1	4·01	4·01	1
32	1·33	1·33	1	3·01	3·01	1
33	2·66	2·66	1	3·01	3·01	1
34	3·51	3·92	1	6	5·75	0·75
35	1·51	1·73	1	5·01	4·06	0·61
36	1·01	1·01	1	3·01	3·01	1
37	8·16	6·34	0·04*	6·01	6·42	0·95
38	3·33	3·37	1	7·01	6·78	0·69
39	6·01	5·71	0·33	6·01	6·62	0·92
40	2·33	2·33	1	3·01	3·01	1
41	2·01	2·01	1	3·01	3·01	1
42	11·01	10·63	0·056	6·01	6·5	0·98

Models in which the null hypothesis (the observed C scores or the number of unique combinations of immune response against virus species were more or equally frequent to that expected by chance) was rejected (P values <0·05) are indicated by an asterisk (*). A total of 10 000 simulations were performed.