irst date/cause of an event beyond a cutoff over several columns <a href="#find-first-date-cause-of-an-event-beyond-a-cutoff-over-several-columns" class="anchor" aria-hidden="true"></a></h2>
          <p class="section-desc"></p><p>Use these functions to find what event occured first and when (e.g. died, lost to follow-up, survived)</p>
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          <p><code><a href="find_date_cause.html">find_date_cause()</a></code> <code><a href="find_date_cause.html">find_st