pan class="math inline">\(\beta_{1}\)</span> is a coefficient associated with an exposure variable of interest taking a value of <span class="math inline">\(z_{0}\)</span> as baseline level and <span class="math inline">\(z_{1}\)</span> as comparative level. Then we can represent the adjusted relative risk as a function of <span class="math inline">\(\boldsymbol{\beta}\)</span> conditional on <span class="math inline">\(\mathbf{X}\)</span>:</p>
<p><span class="math display">\[g(\boldsymbol{\beta}) = \frac{1