| Control times | Case times | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Variable | Mean | Median | sd* | iqr* | N* | Mean | Median | sd* | iqr* | N* |
Herd PRRSv status (proportion positive) | 0.86 | 1.00 | 0.35 | 0.00 | 510 | 0.91 | 1.00 | 0.29 | 0.00 | 170 |
Cumulative local exposure (proportion) | 0.16 | Â | 0.37 | Â | 510 | 0.17 | Â | 0.38 | Â | 170 |
Number of high-risk exposures | 0.04 | 0.00 | 0.20 | 0.00 | 510 | 0.08 | 0.00 | 0.30 | 0.00 | 170 |
High-risk local exposure (proportion) | 0.04 | Â | 0.19 | Â | 510 | 0.08 | Â | 0.27 | Â | 170 |
Number of nursery contacts/month | 1.09 | 0.00 | 2.41 | 0.50 | 510 | 0.75 | 0.00 | 2.09 | 0.00 | 170 |
Number of feed contacts/month | 4.06 | 4.00 | 2.53 | 2.33 | 510 | 4.59 | 4.00 | 3.73 | 4.00 | 170 |
Number of direct contactsa/month | 1.39 | 0.00 | 2.46 | 2.00 | 510 | 1.13 | 0.00 | 2.20 | 1.17 | 170 |
Number of indirect contactsb/month | 6.61 | 5.67 | 4.25 | 3.67 | 510 | 7.01 | 6.00 | 4.08 | 4.00 | 170 |
Total capacity for growing animals | 2161.33 | 2000.00 | 1586.11 | 1525.00 | 510 | 2180.14 | 2000.00 | 1461.31 | 1520.00 | 170 |
Easting (100 kms) | 4.87 | 4.87 | 0.57 | 0.65 | 510 | 5.05 | 5.01 | 0.71 | 0.50 | 170 |
Number of sows | 321.60 | 240.00 | 281.66 | 280.00 | 279 | 357.13 | 240.00 | 398.05 | 290.00 | 92 |
Number of nursery pigs | 1363.81 | 1000.00 | 1170.90 | 1600.00 | 396 | 1355.88 | 900.00 | 1400.92 | 1600.00 | 116 |
Number of finisher pigs | 1308.81 | 1100.00 | 1083.18 | 361.00 | 510 | 1421.15 | 1250.00 | 982.14 | 1350.00 | 127 |
Number of breeding contacts/month | 5.11 | 4.08 | 4.27 | 6.92 | 278 | 5.57 | 4.67 | 4.36 | 7.38 | 92 |
Herd type: farrow-to-finish | 43.14 | Â | Â | Â | 220 | 41.18 | Â | Â | Â | 70 |
Herd type: farrow-to-grow | 11.37 | Â | Â | Â | 58 | 12.94 | Â | Â | Â | 22 |
Herd type: finisher | 21.76 | Â | Â | Â | 111 | 30.00 | Â | Â | Â | 51 |
Herd type: nursery | 17.84 | Â | Â | Â | 91 | 12.35 | Â | Â | Â | 21 |
Herd type: nursery and finisher | 5.88 | Â | Â | Â | 30 | 3.53 | Â | Â | Â | 6 |
High risk exposure: not present | 96.27 | Â | Â | Â | 491 | 92.35 | Â | Â | Â | 157 |
High risk exposure: within ownership | 0.00 | Â | Â | Â | 0 | 2.94 | Â | Â | Â | 5 |
High risk exposure: outside ownership | 3.73 | Â | Â | Â | 19 | 4.71 | Â | Â | Â | 8 |