Covariates evaluated for an association with mortality in groups of cattle either administered zilpaterol hydrochloride (ZH) or not in the multi-feedlot ZH dataset in univariate and multivariable models.

<p>Administration of ZH was associated with mortality (<i>P</i><0.01) in all multivariable models.</p><p>*<i>P</i> value indicated was that observed at the time of removal from the multivariable model if >0.10, or if retained, i.e., ≤0.10, its value in the final multivariable model.</p><p>** Interaction term of the covariate with administration of ZH, i.e., evaluation of potential modification of the association between death loss and administration.