Table 2.
Results of the asymptotic linear-by-linear association test of antibiotic MIC value class frequencies versus years.
| Antibiotic | Z-Value | p-Value |
|---|---|---|
| Doxicycline | +0.79 | 0.428 |
| Enrofloxacin | +2.39 | 0.0168 |
| Erythromycin | −1.68 | 0.0925 |
| Florfenicol | +0.14 | 0.886 |
| Lyncomycin | -1.68 | 0.0928 |
| Oxytetracycline | +0.39 | 0.695 |
| Spiramycin | −1.84 | 0.0654 |
| Tiamulin | −2.06 | 0.0389 |
| Tylosin | −2.21 | 0.0273 |
| Tilmicosin | −1.43 | 0.152 |
| Tylvalosin | +0.56 | 0.574 |
The Z-value is the test statistic used to support or reject the null hypothesis (random distribution of the MIC values throughout the years). Its sign (+/−) indicates the presence of a either a positive or a negative correlation between the ordinal variables.