Variable | Odds ratio | 95% CI | P a | Overall Pb |
---|---|---|---|---|
Estimates based on the maximum likelihood method using assumption of Gaussian distribution | ||||
Herd PRRSv-positive status (no = refc) | 1.56 | (0.89, 2.75) | 0.121 | 0.107 |
Herd type | Â | Â | Â | 0.090 |
   Farrow-to-finish | - - | - | - |  |
   Farrow-to-grow | 1.23 | (0.70, 2.18) | 0.473 |  |
   Finisher | 1.47 | (0.96, 2.26) | 0.077 |  |
   Nursery | 0.74 | (0.43, 1.27) | 0.275 |  |
   Nursery and finisher | 0.59 | (0.23, 1.51) | 0.274 |  |
Easting (100 kms) | Â | Â | Â | 0.002 |
   linear | 1.54 | (1.17, 2.03) | 0.002 |  |
Cumulative local exposure (CLE) (no = ref) | 1.05 | (0.64, 1.70) | 0.852 | 0.852 |
High-risk local exposure(HRLE) (no = ref) | 2.26 | (1.06, 4.83) | 0.035 | 0.040 |
HRLE*Time interaction model | Â | Â | Â | 0.005 |
   HRLE | 0.04 | (0.00, 1.74) | 0.094 | - |
   HRLE*Time (Month) | 1.21 | (1.02, 1.44) | 0.031 | 0.0128 |
Local # of high-risk herds LNHRH (continuous) | 2.16 | (1.06, 4.39) | 0.033 | 0.036 |
Local # of high-risk herds LNHRH (nominal; 0 = ref) | Â | Â | Â | 0.111 |
   One | 2.20 | (1.02, 4.76) | 0.045 |  |
   Two | 4.03 | (0.24, 67.50) | 0.333 |  |
Ownership-adjusted high-risk local exposure (OWHRLE; No high-risk local exposure = ref) | Â | Â | Â | 0.001 |
   High-risk local exposure within ownership | 1.0E+7 | (not estimated) | 0.984 |  |
   High-risk local exposure outside of ownership | 1.31 | (0.54, 3.17) | 0.555 |  |
Number of direct contactsd/month | 0.95 | (0.88, 1.03) | 0.221 | 0.205 |
Number of indirect contacts/month | 1.02 | (0.98, 1.07) | 0.256 | 0.263 |
Number of nursery contacts/month | 0.93 | (0.85, 1.02) | 0.106 | 0.086 |
Number of breeding contacts/monthe | 1.03 | (0.96, 1.10) | 0.407 | 0.407 |
Number of feed contacts/month | 1.06 | (1.00, 1.12) | 0.043 | 0.045 |
Estimates of the high-risk local exposure obtained using exact logistic regression | ||||
Herd PRRSv-positive status (no = ref) | 1.56 | (0.87, 2.95) | 0.151 | 0.151 |
Cumulative local exposure (CLE) (no = ref) | 1.05 | (0.62, 1.74) | 0.901 | 0.901 |
High-risk local exposure(HRLE) (no = ref) | 2.26 | (0.97, 5.18) | 0.049 | 0.049 |
Local # of high-risk herds LNHRH (continuous) | 2.16 | (0.99, 4.69) | 0.043 | 0.043 |
Local # of high-risk herds LNHRH (nominal; 0 = ref) | Â | Â | Â | 0.108 |
   One | 2.18 | (0.92, 5.04) | 0.049 |  |
   Two | 4.03 | (0.05, 330.32) | 0.367 |  |
Ownership-adjusted high-risk local exposure (OWHRLE; No high-risk local exposure = ref) | Â | Â | Â | 0.001 |
   High-risk local exposure within ownership | 20.17f | (2.75, +inf) | 0.001 |  |
   High-risk local exposure outside of ownership | 1.31 | (0.46, 3.39) | 0.634 |  |