d>site_id.</td><td>The site ID</td><td>Character</td></tr><tr><td>(event)_count</td><td>Site event count</td><td>Numeric</td></tr><tr><td>(event)_per_visit_site</td><td>Site Ratio of event count divided by visits</td><td>Numeric</td></tr><tr><td>visits</td><td>Site visit count</td><td>Numeric</td></tr><tr><td>n_pat</td><td>Site patient count</td><td>Numeric</td></tr><tr><td>(event)_per_visit_study</td><td>Simulated study ratio</td><td>Numeric</td></tr><tr><td>(event)_prob</td><td>Site event ratio probabilit