ct specifying where the cohort attributes can be found to construct covariates. The
attributes should be defined in a table with the same structure as the attribute_definition table
in the Common Data Model. It should at least have these columns:</p><dl><dt>attribute_definition_id</dt>
<dd><p>A unique identifier of type integer.</p></dd>
 <dt>attribute_name</dt>
<dd><p>A short
description of the attribute.</p></dd>

</dl><p>The cohort attributes themselves should be stored in a table with
the same format as