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Table 2 Categorical variables and their levels collected from 112 sows

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

Variable Level Sows / level
   (n) (%)
Parity 1. parity 32 28.6
2. parity 18 16.1
3. parity 11 9.8
4. parity 17 15.2
5. parity 7 6.3
6. parity 6 5.4
7. parity 9 8.0
8. parity 8 7.1
9. parity 4 3.6
Time of farrowing* day 66 58.9
night 46 41.1
Abnormal behaviour (aggression, etc.) no 105 93.8
yes 7 6.2
Diseases no 95 84.8
local diseases** 5 4.5
systemic disease incl. PPDS 12 10.7
Time of occurrence of disease day of partum 1 5.9
1 day post-partum 8 47.1
2 days post-partum 2 11.8
3 days post-partum 4 23.5
later 2 11.8
Facultative treatment with antibiotics effective against M. hyopneumoniae*** no 94 83.9
yes 18 16.1
Level of antibodies against M. hyopneumoniae ante-partum S/P ratio < 0,4 25 22.3
  S/P ratio ≥ 0,4 87 77.7
Level of antibodies against M. hyopneumoniae post-partum S/P ratio < 0,4 52 46.8
  S/P ratio ≥ 0,4 59 53.2
  1. *‘day’ linked to working hours, whereas ‘night’ was out of working hours.
  2. **local disease = arthritis, circumscribed dermatitis, shoulder lesion, etc.
  3. ***treatments with amoxicillin, ampicillin, colistin and penicillin were considered being NOT effective against M. hyopneumoniae, whereas apramycin, enrofloxacin, tetracyclin and tulathromycin were taken into account as being effective against M. hyopneumoniae.