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Table 3 Categorical variables of ‘production data’ and their levels collected from 1,127 suckling pigs

From: Individual risk factors for Mycoplasma hyopneumoniae infections in suckling pigs at the age of weaning

Variable Level All piglets Mhyo neg. Mhyo pos.
   (n) (%)1 n (%)1 n (%)1
Gender Male 572 50.8 554 (51.0) 18 (43.9)
Female 555 49.2 532 (49.0) 23 (56.1)
Health status after birth Good 1091 96.8 1051 (96.8) 40 (97.6)
Moderate/poor 36 3.2 35 (3.2) 1 (2.2)
Special health conditions None 1026 91.0 990 (91.2) 36 (87.8)
Congenital conditions 55 4.9 53 (4.9) 2 (4.9)
Others (e.g. injuries) 46 4.1 43 (3.9) 3 (7.3)
Suckled teatx 1st or 2nd pair from cranial 328 29.1 320 (29.5) 8 (19.5)
  3rd or 4th pair from cranial 327 29.0 311 (28.6) 16 (39.0)
  5th to last pair from cranial 181 12.1 173 (15.9) 8 (19.5)
  Varying 291 25.8 282 (26.0) 9 (22.0)
Cross-fostered No 946 83.9 911 (83.9) 35 (85.4)
Yes 181 16.1 175 (16.1) 6 (14.6)
Individual contact to new litter mates from other sows due to cross-fostering No 691 61.3 670 (61.7) 21 (51.2)
To piglets from negative sows 152 13.5 146 (13.4) 6 (14.6)
To piglets from positive sows 21 1.9 21 (1.9) 0 (0.0)
To piglets from sowsne 263 23.3 249 (22.9) 14 (34.2)
Individual contact to piglets either negative or positive for M. hyopneumoniae No 385 34.2 385 (35.5) 0 (0.0)
To foreign negative piglets 368 32.7 368 (33.9) 0 (0.0)
To foreign positive piglets 36 3.2 36 (3.3) 0 (0.0)
To positive litter mates 338 30.0 297 (27.3) 41 (100)
Cross-fostering of piglets into Neighbouring pen 26 14.4 25 (14.3) 1 (16.7)
Pen in the same compartment 106 58.6 104 (59.4) 2 (33.3)
  Pen in another compartment 49 27.0 46 (26.3) 3 (50.0)
Time of cross-fostering Day of birth 85 47.0 84 (48.0) 1 (16.7)
1. day of life 12 6.6 12 (6.9) 0 (0.0)
2.-7. day of life 46 25.4 43 (24.6) 3 (50.0)
  8.-21. day of life 38 21.0 36 (20.6) 2 (33.3)
  1. Using PCR results from suckling pigs´ nasal swabs as a binomial outcome variable, the incidence rate ratio (IRR; recognizing the first level of each variable as baseline in a univariable Poisson regression analysis) were calculated.
  2. ne not examined for M. hyopneumoniae.
  3. xbased on ≥3 identical results assessed during 5 days of observation.
  4. 1 column-percent per variable.