Forest plots of odds ratios for breast cancer recurrence in node negative and in node positive patients with extended adjuvant tamoxifen (>5 years) versus adjuvant tamoxifen (5 years) based on primary analysis of individual trials.

<p>Odds ratios for each trial are represented by the <b>squares</b>, the <b>size of the square</b> represents the weight of the trial in the meta-analysis, and the <b>horizontal line</b> crossing the square represents the 95% confidence interval. The diamonds represent the estimated pooled effect based for each cohort individually (labeled subtotal) and for all cohorts together (labeled total).