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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.