Histogram of frequencies (%) of patients with positive lymph node (N1) status by category of life stress events.

Abstract

<p>Dark bars depict percentage frequencies of N1 patients who experienced repeated stress (at least one event of the category occurred more than once), light bars depict percentage frequencies of N1 patients who did not experience repeated stress (all events in the category occurred once or never). Asterisks indicate significant P-values derived from Chi-squared test.</p