TABLE 4.
Comparison of variables within using generalized linear modeling for categories: stages of production, different farms, sample types, environments, and seasons
| Positive/totala | Odds ratio (OR) | Lower CL | Upper CL | Standard error | P value (Tukey) | |
|---|---|---|---|---|---|---|
| Stages | ||||||
| Production farms | 36/640C | Reference group | ||||
| Processing plant | 103/238A | 33.228 | 14.455 | 82.117 | 0.442 | <0.0001 |
| Transport | 37/93B | 9.568 | 4.632 | 20.526 | 0.379 | <0.0001 |
| Hatchery | 16/63B | 3.794 | 1.853 | 7.548 | 0.357 | 0.0011 |
| Production farms | ||||||
| Broiler | 7/280B | Reference group | ||||
| Breeder | 25/189A | 5.141 | 2.245 | 13.318 | 0.447 | 0.0007 |
| Pullet | 4/171B | 0.942 | 0.240 | 3.236 | 0.645 | 0.9953 |
| Sample types | ||||||
| Litter grab | 1/41 | Reference group | ||||
| Beetle trap | 2/73 | 1.093 | 0.097 | 24.560 | 1.263 | 1.0000 |
| Boot swab | 3/41 | 3.284 | 0.387 | 69.260 | 1.193 | 0.9751 |
| Fly paper | 2/157 | 0.482 | 0.032 | 11.941 | 1.361 | 0.9995 |
| Miscellaneous | 7/104 | 1.920 | 0.142 | 49.784 | 1.382 | 0.9998 |
| Soil | 2/38 | 1.774 | 0.085 | 57.237 | 1.557 | 1.0000 |
| Sponge stick swabs | 12/95 | 4.560 | 0.819 | 85.603 | 1.072 | 0.8504 |
| Water drainage | 7/91 | 2.444 | 0.170 | 67.434 | 1.423 | 0.9985 |
| Environment | ||||||
| Indoor | 19/324 | Reference group | ||||
| Outdoor | 17/316 | 1.233 | 0.226 | 8.476 | 0.912 | 0.8192 |
| Season | ||||||
| Spring | 4/171 | Reference group | ||||
| Summer | 26/302 | 3.555 | 1.330 | 12.348 | 0.554 | 0.0572 |
| Fall | 6/167 | 1.566 | 0.426 | 6.374 | 0.670 | 0.7813 |
a
Data were analyzed using generalized linear modeling for binomial distribution. Means not sharing a common letter were significantly different (P < 0.05).