Risk factor | n | Animals - positive/total (%) | P-value |
---|---|---|---|
Farm level | 60 farms | Â | Â |
 Use of specialized boots |  |  | 0.94 |
  No | 20 | 95/1198 (7.9 %) |  |
  Yes | 40 | 156/2397 (6.5 %) |  |
 Use of specialized clothes |  |  | 0.18 |
  No | 20 | 92/1193 (7.7 %) |  |
  Yes | 40 | 159/2402 (6.6 %) |  |
 Empty period (days) of farrowing rooms | 0.89 | ||
 Empty period (days) of rooms for >3 months old animals | 0.30 | ||
 Danish entry |  |  | <0.001 |
  No | 43 | 172/2487 (6.9 %) |  |
  Yes | 17 | 77/1048 (7.3 %) |  |
 Number of sows per farm |  |  | <0.001 |
 Presence of dairy cattle |  |  | <0.001 |
  No | 54 | 207/3236 (6.4 %) |  |
  Yes | 6 | 44/359 (12.3 %) |  |
 Presence of beef cattle |  |  | 0.03a |
  No | 56 | 242/3356 (7.2 %) |  |
  Yes | 4 | 9/239 (3.8 %) |  |
 Presence of sheep |  |  | 0.005a |
  No | 58 | 234/3475 (6.7 %) |  |
  Yes | 2 | 17/120 (14.2 %) |  |
 Presence of goats |  |  | 0.21a |
  No | 59 | 249/3535 (7.0 %) |  |
  Yes | 1 | 2/60 (3.3 %) |  |
 Presence of poultry |  |  | 0.01a |
  No | 57 | 246/3415 (7.2 %) |  |
  Yes | 3 | 5/180 (2.8 %) |  |
Room level | 234 rooms | Â | Â |
 Floor type |  |  | 0.97 |
  Slatted floor | 225 | 242/3457 (7.0 %) |  |
  Straw | 1 | 1/15 (6.7 %) |  |
  Slatted and concrete floor | 8 | 8/123 (6.5 %) |  |
 Feed distribution |  |  | 0.09 |
  Automatic system | 79 | 73/1219 (5.9 %) |  |
  Manual distribution | 155 | 178/2376 (7.5 %) |  |
Individual level | 3595 pigs | Â | Â |
 Age |  |  | 0.002 |
  <1 month | 545 | 29/545 (5.3 %) |  |
  1–2 months | 438 | 36/438 (8.2 %) |  |
  2–3 months | 790 | 76/790 (9.6 %) |  |
  >3 months | 1822 | 110/1822 (6.0 %) |  |