n><span class="va">bt</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="fu"><a href="https://rdrr.io/r/utils/str.html" class="external-link">str</a></span><span class="op">(</span><span class="va">bt_df</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> tibble [136 × 4] (S3: tbl_df/tbl/data.frame)</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ patient_id: chr [1:136] "123456" "123456" "123456" "123456" ..