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Table 2 Results from the mixed logistic model of the probability of a positive bacteriology result for non-reactor animals at the single intradermal tuberculin (SIT) test, interferon-gamma (IFN-γ) assay and both tests used in parallel from infected herds from Castilla y Leon, Spain

From: Risk factors associated with negative in-vivodiagnostic results in bovine tuberculosis-infected cattle in Spain

Dataset (n) Variable Class (n) N Number of T-/C + animals (%) OR P
Non-reactors if the severe SIT test and 0.05 IFN-γ assay are used in parallel: N = 927 Age 1st Q: 0.2-2 231 10 (4.3%) 1 NA
2nd Q: >2-4.8 231 22 (9.5%) 1.52 (0.61-3.78) 0.36
3rd Q: >4.8-8.5 233 29 (12.4%) 2.32 (0.97-5.53) 0.06
4th Q: >8.5-33.6 232 49 (21.1%) 3.89 (1.62-9.30) 0.002
Productive type Beef 456 33 (7.2%) 1 NA
Dairy 286 18 (6.3%) 0.26 (0.07-1.06) 0.06
Bullfighting 185 59 (31.9%) 3.64 (1.38-9.59) 0.009
Number of herd tests 1 190 59 (31.1%) 1 NA
2 253 30 (11.9%) 0.58 (0.27-1.25) 0.17
3 342 14 (4.1%) 0.18 (0.08-0.43) <0.001
4 or more 142 7 (4.9%) 0.07 (0.02-0.21) <0.001
Non-reactors in the severe SIT test, N = 3,161 Age 1st Q: 0.2-1.7 790 88 (11.1%) 1 NA
2nd Q: >1.7-4.9 790 154 (19.5%) 1.42 (0.75-2.66) 0.28
3rd Q: >4.9-8.7 791 208 (26.3%) 3.68 (2.16-6.26) <0.001
4th Q: >8.7-33.6 790 318 (40.3%) 6.59 (3.92-11.08) <0.001
Productive type Beef 1776 255 (14.4%) 1 NA
Dairy 512 30 (5.9%) 0.27 (0.06-1-17) 0.08
Bullfighting 873 483 (55.3%) 11.1 (5.10-24.1) <0.001
Interaction age*productive type Bullfighting *1st Q 164 58 (35.4%) 1 NA
Bullfighting *2nd Q 208 97 (46.6%) 1.28 (0.58-2.81) 0.56
Bullfighting *3rd Q 205 85 (41.5%) 0.53 (0.26-1.09) 0.08
Bullfighting *4th Q 296 102 (34.5%) 0.50 (0.25-0.99) 0.04
Number of herd tests 1 1268 534 (42.1%) 1 NA
2 850 134 (15.8%) 0.33 (0.25-0.44) <0.001
3 641 46 (7.2%) 0.16 (0.11-0.24) <0.001
4 or more 402 54 (13.4%) 0.23 (0.15-0.34) <0.001
Non-reactors in the standard SIT test, N = 3,263 Age 1st Q: 0.2-1.7 816 89 (10.9%) 1 NA
2nd Q: >1.7-4.8 815 157 (19.3%) 1.44 (0.78-2.64) 0.24
3rd Q: >4.8-8.6 816 214 (26.2%) 3.80 (2.26-6.37) <0.001
4th Q: >8.6-33.6 816 328 (40.2%) 6.39 (3.86-10.6) <0.001
Productive type Beef 1862 270 (14.5%) 1 NA
Dairy 522 30 (5.7%) 0.25 (0.06-1.10) 0.07
Bullfighting 879 488 (55.5%) 10.6 (4.95-22.8) <0.001
Interaction age*productive type Bullfighting *1st Q 164 58 (35.4%) 1 NA
Bullfighting *2nd Q 206 112 (54.4%) 1.30 (0.60-2.82) 0.51
Bullfighting *3rd Q 209 121 (57.9%) 0.50 (0.24-1.00) 0.05
Bullfighting *4th Q 300 197 (65.7%) 0.52 (0.26-1.02) 0.06
Number of herd tests 1 1316 551 (41.9%) 1 NA
2 868 136 (15.7%) 0.33 (0.25-0.44) <0.001
3 663 46 (6.9%) 0.15 (0.10-0.23) <0.001
4 or more 416 55 (13.2%) 0.24 (0.16-0.35) <0.001
Non-reactors in the 0.05 IFN-γ assay: N = 1,129 Age 1st Q: 0.5-1.8 281 14 (5.0%) 1 NA
2nd Q: >1.8-4.6 284 31 (10.9%) 1.45 (0.68-3.08) 0.34
3rd Q: >4.6-8.1 281 41 (14.6%) 2.20 (1.07-4.51) 0.03
4th Q: >8.1-33.6 283 60 (21.2%) 2.86 (1.37-5.96) 0.005
Productive type Beef 595 51 (8.6%) 1 NA
Dairy 324 22 (6.8) 0.25 (0.08-0.77) 0.02
Bullfighting 210 73 (34.8) 3.13 (1.49-6.54) 0.002
Number of herd tests 1 260 80 (30.8%) 1 NA
2 306 39 (12.7%) 0.55 (0.30-1.04) 0.06
3 387 18 (4.7%) 0.18 (0.09-0.36) <0.001
4 or more 176 9 (5.1%) 0.09 (0.04-0.23) 0.059
Non-reactors in the 0.1 IFN-γ assay: N = 1,959 Age 1st Q: 0.5-1.9 488 30 (6.1%) 1 NA
2nd Q: >1.9-4.8 492 66 (13.4%) 1.76 (1.04-2.97) 0.03
3rd Q: >4.8-8.6 489 91 (18.6%) 2.58 (1.57-4.24) <0.001
4th Q: >8.6-33.6 490 150 (30.6%) 4.98 (3.06-8.09) <0.001
Productive type Beef 1183 135 (11.4%) 1 NA
Dairy 370 25 (6.8%) 0.38 (0.15-0.98) 0.04
Bullfighting 406 177 (43.6%) 5.70 (3.14-10.3) <0.001
Number of herd tests 1 654 209 (32.0%) 1 NA
2 535 70 (13.1%) 0.37 (0.25-0.56) <0.001
3 517 34 (6.6%) 0.23 (0.14-0.38) <0.001
4 or more 254 24 (9.5%) 0.21 (0.12-0.36) <0.001
  1. Significant values are indicated in bold.
  2. *Indicates interaction between two variables.
  3. NA: Non-applicable.
  4. T-/C+: Animals negative in the in-vivo diagnostic test and positive in bacteriology.