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Table 2 Analysis of risk factors associated with prevalence of M. bovis in cattle herds of the micro region of Garanhuns, state of Pernambuco, Brazil, 2014

From: Molecular detection of Mycobacterium bovis in cattle herds of the state of Pernambuco, Brazil

Risk factors

n

Positive

Negative

OR (95 % CI)

p value

AF

RF%

AF

RF%

Herd sizea

  < 50 animals

9

2

22.2

7

77.8

-

0.467

 51–100 animals

6

3

50.0

3

50.0

3.50 (0.37–32.97)

 101–200 animals

2

1

50.0

1

50.0

1.00 (0.04–24.55)

  > 200 animals

2

-

-

2

100

-

Rearing system

 Intensive

3

1

33.3

2

66.7

-

0.788

 Extensive

2

1

50.0

1

50.0

2.00 (0.05–78.25)

 Semi-Intensive

15

4

26.7

11

73.3

0.36 (0.02–7.30)

Origin of replacement animals

 Farm’s own herd

12

4

33.3

8

66.7

0.67 (0.09–4.92)

0.544

 Other farms

8

2

25.0

6

75.0

Quarantine

 Yes

4

1

25.0

3

75.0

1.36 (0.11–16.57)

0.657

 No

16

5

31.3

11

68.8

BTB diagnostic tests upon animals’ acquisitiona

 Yes

10

3

30.0

7

70.0

1.16 (0.16–8.0)

0.630

 No

9

3

33.3

6

66.7

Water sourcea

 Stagnant

14

4

28.6

10

71.4

1.66 (0.19–14.0)

0.520

 Running

5

2

40.0

3

60.0

Milking procedure

 Manual

12

4

33.3

8

66.7

0.66 (0.09–4.92)

0.544

 Mechanic

8

2

25.0

6

75.0

Frequency of cleaning the farm facilitiesa

 Daily

12

3

25.0

9

75.0

-

0.360

 Weekly

3

2

66.7

1

33.3

6.00 (0.39–92.28)

 Monthly

2

1

50.0

1

50.0

0.50 (0.01–19.56)

Udder disinfection

 Yes

7

1

14.3

6

85.7

3.75 (0.34–41.0

0.276

 No

13

5

38.5

8

61.5

Feeding colostrum to calves

 Yes

17

5

29.4

12

70.6

1.20 (0.08–16.44)

0.370

 No

3

1

33.3

2

66.7

History of bovine tuberculosis in the herda

 Yes

2

-

-

2

100.0

-

0.456

 No

17

6

35.3

11

64.6

  1. AF absolute frequency, RF relative frequency, OR odds ratio, 95 % CI 95 % confidence interval
  2. aNot all the respondents answered the question