A review synthesising findings across multiple systematic reviews/meta-analyses on one topic.
An umbrella review pools conclusions from existing systematic reviews and meta-analyses rather than from individual primary studies, giving a bird's-eye view of an evidence base. Because the same primary trials often appear in several included reviews, an 'overlap-aware' umbrella review explicitly quantifies this double-counting so readers aren't misled into thinking independent reviews equal independent evidence.
This guide was auto-drafted and is pending editorial review.