Table 2. Results from the reduced logistic regression models*.
| Variable |
OR (95% CI) |
Estimate (95% CI) |
SE (Est.) |
p value |
|---|---|---|---|---|
| Resistance vs. nonresistance | ||||
| Intercept |
0.164 (0.129 to 0.207) |
–1.81 (–2.05 to –1.57) |
0.121 |
|
| Origin |
5.08 (4.19 to 6.18) |
1.62 (1.43 to 1.82) |
0.0988 |
<0.00001 |
| Year |
1.27 (1.19 to 1.35) |
0.235 (0.174 to 0.297) |
0.0313 |
<0.00001 |
| Cattle vs. poultry |
0.400 (0.230 to 0.662) |
–0.917 (–1.47 to –0.413) |
0.268 |
<0.00001 |
| Pork vs poultry |
1.26 (1.06 to 1.51) |
0.233 (0.0553 to 0.414) |
0.0916 |
|
| Multidrug resistance vs. resistance | ||||
| Intercept μ |
0.141 (0.0976 to 0.201) |
–1.96 (–2.33 to –1.60) |
0.185 |
|
| Origin |
4.98 (3.87 to 6.44) |
1.61 (1.35 to 1.86) |
0.129 |
<0.00001 |
| Year |
1.14 (1.03 to 1.27) |
0.133 (0.0259 to 0.240) |
0.0547 |
0.0148 |
| Nalidixic acid resistance vs. non–nalidixic acid resistance | ||||
| Intercept |
0.0611 (0.0333 to 0.107) |
–2.80 (–3.40 to –2.24) |
0.296 |
|
| Origin |
6.54 (3.45 to 12.8) |
1.88 (1.24 to 2.55) |
0.334 |
|
| Year |
1.41 (1.18 to 1.69) |
0.342 (0.167 to 0.526) |
0.0914 |
|
| Origin and year |
0.732 (0.587 to 0.909) |
–0.311 (–0.532 to –0.0956) |
0.111 |
0.00448 |
| Cattle vs. poultry |
0.0404 (0.00229 to 0.182) |
–3.21 (–6.08 to –1.70) |
1.01 |
<0.00001 |
| Pork vs. poultry | 0.0668 (0.0425 to 0.101) | –2.71 (–3.16 to –2.29) | 0.220 | |
*OR, odds ratio; CI, confidence interval; SE, standard error; Est., estimated.