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Table 5 Survival analysis test to compare the times of the first appearance of a particular clinical sign in BSE positive and negative cases.

From: Pruritus is a common feature in sheep infected with the BSE agent

 

Presence during the monitoring period

P-value *

Clinical sign

Negative cases (n)

Positive cases (n)

Log-rank test

Wilcoxon test

Behaviour change

17

16

++

 

Rubbing/scratching

34

23

ns

 

Nibbling

25

21

+

 

Positive scratch test

4

18

+++

 

Fleece change

28

18

 

ns

Alopecia

4

14

+++

 

Skin lesions

5

10

+

 

Self-induced scratch response

7

18

+++

 

Bruxism when handled

9

9

+++

 

Bruxism when free during examination

7

5

 

ns

Bruxism at observation

17

17

+

 

Tremors

2

14

+++

 

Ataxia

2

13

 

+++

Weight loss

29

22

 

+

Loss of body condition

20

18

+++

 
  1. * P-values: + ≤ 0.04;
  2. ++ ≤ 0.001;
  3. +++ ≤ 0.0001;
  4. ns statistically not significant (P > 0.05)