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Table 2 Univariate analysis: proportion of animals positive to the IFNγ test at the index test, by risk factors.

From: Identification of risk factors associated with disclosure of false positive bovine tuberculosis reactors using the gamma-interferon (IFNγ) assay

Variable

Category

No. of animals

No. positive to gamma interferon

% positive to gamma interferon

p-value

Age (years)

0.5–1

807

65

8.1

0.059

2

351

28

8.0

3–4

334

32

9.6

≥ 5

665

74

11.1

Region

NE

204

17

8.3

0.029

NW

995

59

5.9

SE

398

20

5.0

SW

560

103

18.4

Month

4

185

10

5.4

0.043

5

212

13

6.1

6

266

26

9.8

7

273

13

4.8

8

319

31

9.7

9

273

15

5.5

10

479

73

15.2

11

102

14

13.7

12

48

4

8.3

Breed1

AA

280

21

7.5

0.408

BB

88

7

8.0

CH

497

38

7.6

FR

412

62

15.0

HE

130

17

13.1

LM

404

31

7.7

SH

54

2

3.7

SI

198

11

5.6

Other

94

10

10.6

Herd type

Beef

307

35

11.4

0.072

Dairy

569

85

14.9

Mixed

20

1

5.0

Suckler

1261

78

6.2

Gender

Female

1671

170

10.2

0.108

Male

486

29

6.0

Animal class2

Bull

38

3

7.9

0.206

Cow

1119

116

10.4

Heifer

550

54

9.8

Steer

448

26

5.8

  1. 1 Animal Breed: AA (Aberdeen Angus), BB (Belgian Blue), CH (Charolais), FR (Friesian), HE (Hereford), LM (Limousin), SH (Shorthorn), SI (Simmental). Regions: NE (North-East), NW (North-West), SE (South-East), SW (South-West).
  2. 2 Two animals had no animal class recorded and 1 pregnant heifer was recoded to heifer due to small numbers.