Table 3.
Odds ratios, confidence intervals for odds ratios, P-values, P-value rank, and calculated Benjamini Hochberg cutoff values for significance of univariable models examining the odds of a fecal pat from cattle in commercial feedlots testing positive for ciprofloxacin-resistant Escherichia coli and independent variables related to starling population, pen, and feedlot characteristics.
| Variablea | ORb | OR 95% CIc | P-value | Rankd | (rank/m)*αe |
|---|---|---|---|---|---|
| Days on Finishing Ration | 1.445 | 1.032–2.023 | 0.0320 | 1 | 0.003 |
| Cattle Entry Weight | 0.998 | 0.996–1.000 | 0.0645 | 2 | 0.007 |
| Number of Cows per Pen | 0.996 | 0.992–1.001 | 0.1436 | 3 | 0.010 |
| Cattle Exit Weight | 0.998 | 0.995–1.001 | 0.2022 | 4 | 0.013 |
| Cattle Days in Pen | 1.003 | 0.997–1.009 | 0.3261 | 5 | 0.017 |
| Number of Birds in Water Troughs | 1.017 | 0.980–1.056 | 0.3726 | 6 | 0.020 |
| Number of Cattle in Feedlot | 1.010 | 0.983–1.037 | 0.4670 | 7 | 0.023 |
| Sampling Period | 1.417 | 0.538–3.735 | 0.4692 | 8 | 0.027 |
| Weight Gained by Cattle | 1.001 | 0.999–1.003 | 0.4829 | 9 | 0.030 |
| Troughs Recycle Water | 1.334 | 0.090–19.792 | 0.8289 | 10 | 0.033 |
| Water Troughs Split Pens | 0.575 | 0.086–3.837 | 0.8396 | 11 | 0.036 |
| Time of Day Sample Collected | 1.000 | 0.997–1.003 | 0.8571 | 12 | 0.040 |
| Daily High Temperature | 0.996 | 0.994–1.050 | 0.8822 | 13 | 0.043 |
| Number of Birds in Pen | 1.000 | 0.999–1.001 | 0.9198 | 14 | 0.047 |
| Number of Birds in Feed | 1.000 | 0.997–1.002 | 0.9210 | 15 | 0.050 |
aAnalyses of variables potentially associated with ciprofloxacin-resistant Escherichia coli contamination of cattle feed samples
bOdds ratios for variables potentially associated with ciprofloxacin-resistant Escherichia coli fecal shedding by cattle.
c95% confidence intervals for odds ratios of potential explanatory variables associated with ciprofloxacin-resistant Escherichia coli fecal shedding by cattle.
dRank order of p-values from analyses of potential explanatory variables associated with ciprofloxacin-resistant Escherichia coli fecal shedding by cattle.
eBenjamini Hochberg cutoff values for rejection of null hypotheses. Based on these cutoff values, we failed to reject null hypotheses for all univariable analyses assessing ciprofloxacin-resistant Escherichia coli fecal shedding by cattle.