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Table 1 Description of the categorical explanatory variables related to the serological status to bacterial and viral pathogens

From: Factors associated with the growing-finishing performances of swine herds: an exploratory study on serological and herd level indicators

Definition of the variables % herds per level
% of pigs seropositive to Lawsonia intracellularis after 16 weeks of age
  < 60% 26.83
  ≥ 60% 73.17
Pigs seropositive to Lawsonia intracellularis
 before 16 weeks of age 51.22
 after 16 weeks of age 48.78
% of finishing pigs seropositive to Lawsonia intracellularis
  < 50% 60.98
  ≥ 50% 39.02
Serological status to Mycoplasma hyopneumoniae
 Negative 55
 Positive (at least one positive sample) 45
Serological profile to Mycoplasma hyopneumoniae
 Negative 55
 Positive before 16 weeks of age (at least one positive sample) 37.5
 Positive after 16 weeks of age (at least one positive sample) 7.5
% of pigs with antibodies against Mycoplasma hyopneumoniae before 16 weeks of age
  ≤ 20% 80.49
  > 20% 19.51
% of pigs with antibodies against Mycoplasma hyopneumoniae before 16 weeks of age
  ≤ 10% 73.17
  > 10% 26.83
% of pigs with antibodies against Mycoplasma hyopneumoniae after 16 weeks of age
  ≤ 10% 80.49
  > 10% 19.51
% of pigs with antibodies against Mycoplasma hyopneumoniae during the finishing phase
  ≤ 10% 78.05
  > 10% 21.95
% of pigs with antibodies against swine Influenza A virus
  ≤ 20% 56.1
  > 20% 43.9
% of pigs with antibodies against swine Influenza A virus
  ≤ 80% 70.73
  > 80% 29.27
Serological status to swine Influenza A virus
 Negative 46.34
 Positive (at least one positive sample) 53.66
Antibodies against PRRSV before 16 weeks of age
 No 80.49
 Yes (at least one positive pool) 19.51
Antibodies against PRRSV after 16 weeks of age
 No 56.1
 Yes (at least one positive pool) 43.9
Serological status to PRRSV
 Negative 56.1
 Positive (at least one positive pool) 43.9
Serological profile to PRRSV
 Negative 56.1
 Positive before 16 weeks of age (at least one positive pool) 19.51
 Positive after 16 weeks of age (at least one positive pool) 24.39
% of pigs with antibodies against Porcine Circovirus Type 2 (PCV2) before 16 weeks of age
  ≤ 50% 29.27
  > 50% 70.73
% of pigs with antibodies against Porcine PCV2 after 16 weeks of age
  ≤ 70% 19.51
  > 70% 80.49
Anti-PCV2 IgG antibody titers > 5000 ELISA units before 16 weeks of age
 No 85.37
 Yes (at least one pig) 14.63
Anti-PCV2 IgG antibody titers > 5000 ELISA units after 16 weeks of age
 No 31.71
 Yes (at least one pig) 68.29
Anti-PCV2 IgG antibody titers > 5000 ELISA units during the fattening phase
 No 31.71
 Yes (at least one pig) 68.29
> 10% of pigs with a SERELISA® titer > 5000 ELISA Units for antibodies against PCV2
 No 41.46
 Yes 58.54
> 20% of pigs with a SERELISA® titer > 5000 ELISA Units for antibodies against PCV2
 No 51.22
 Yes 48.78