Table 4 Comparison of the treatment incidence (mean and standard deviation) and biosecurity scores (two-sample t-Test for equal means) of farms below (n = 30) and above (n = 30) the median TI 200 days (186.1)
|  | Group 1: Farms < median TI 200 days (na=30) | Group 2: Farms > median TI 200 days (na=30) | P-value3 |
|---|---|---|---|
Treatment incidence | Mean (SDb) | Â | |
 TI suckling pigs | 162.0 (185.1) | 328.2 (297.5) |  |
 TI weaned pigs | 284.4 (168.5) | 982.4 (468.5) |  |
 TI fattening pigs | 21.9 (32.0) | 84.0 (95.1) |  |
 TI 200 days | 113.0 (53.0) | 372.6 (146.4) |  |
 TI breeding pigs | 45.0 (53.0) | 39.2 (46.0) |  |
Biosecurity scores | Mean (SDb) | Â | |
 External biosecurity | |||
  Purchasing policy | 87.9 (10.0) | 88.1 (8.8) | 0.94 |
  Removing animals, manure, carcasses | 80.7 (9.8) | 77.5 (11.1) | 0.24 |
  Supply fodder, water, equipment | 48.7 (15.2) | 43.5 (12.4) | 0.15 |
  Access check | 76.7 (15.3) | 65.9 (15.0) | < 0.01 |
  Vermin, bird control | 75.0 (18.7) | 67.0 (20.7) | 0.11 |
  Location, environment | 58.0 (27.6) | 20.0 (22.1) | < 0.01 |
 Internal biosecurity | |||
  Management diseases | 55.1 (22.0) | 49.8 (19.1) | 0.33 |
  Farrowing, suckling period | 69.2 (16.2) | 75.3 (18.0) | 0.17 |
  Nursery period | 78.5 (16.0) | 77.9 (19.0) | 0.91 |
  Fattening period | 40.4 (13.2) | 42.5 (17.0) | 0.59 |
  Compartmentalizing, working lines, equipment | 43.0 (20.2) | 45.6 (18.2) | 0.56 |
  Cleaning, disinfection | 74.2 (8.2) | 66.2 (8.1) | < 0.01 |